What Are Early Signs To Detect Miscarriage at 4 Weeks?

Most women who are pregnant will worry about having any sign of miscarriage at 4 weeks.

The truth is, very early miscarriage (often called a chemical pregnancy) is relatively common. Some research suggests that more than 30 percent of all pregnancies end in miscarriage, and many of these happen very early, before a woman even knows she is pregnant.

You should know that at four weeks into your pregnancy, you have just missed your period. Some women may not even know they are pregnant at this time.

If you are already pregnant, you may start having strange pregnancy symptoms. Common pregnancy symptoms you are likely to experience are:

• Vomiting or nausea that is especially worse in the morning

• Spotting before your period

• Body weakness

• Abdominal cramps

• Change in mood

• Frequent urination

• Food aversion

Most women will be concerned when they encounter pregnancy symptoms with vaginal bleeding. Bleeding in early pregnancy is common and does not always mean miscarriage, but it can sometimes be a warning sign, so it’s important to let your doctor or clinic know if you notice any bleeding.

Sometimes, light spotting around the time your period is due may be due to implantation bleeding.

Implantation bleeding occurs in some women after the embryo is successfully attached to the uterus after fertilization. It is usually lighter than a normal period and may last only a short time.

After implantation, your body increases human chorionic gonadotropin (HCG), a hormone that helps detect if you are pregnant or not. As each day passes by after implantation, HCG hormone will continue to rise and can be tested for confirmation of pregnancy.

If you had a miscarriage, you would most likely have vaginal bleeding, abdominal cramps and decreasing levels of HCG hormone.

In most cases, an early miscarriage cannot be prevented, and once bleeding and cramping from a miscarriage have started, there is usually no treatment that can stop it. Don’t forget, at this very early stage your pregnancy is still tiny, and you are unlikely to recognize specific fetal parts in the blood and clots.

This article explains the symptoms of miscarriage at 4 weeks, when to worry and steps you should take.

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Miscarriage at 4 weeks: What are the signs?

1. Vaginal bleeding

Spotting in the very early days of your pregnancy before you miss your period is common in some women. This bleeding may occur due to implantation.

At four weeks there are many other reasons you may have vaginal bleeding. Cervical trauma or vaginal wall injury during intercourse can cause some form of bleeding.

Though spotting could mean a minor problem, the most common sign most women will experience when having a miscarriage is vaginal bleeding with lower abdomen cramps.

It’s unlikely you will see obvious fetal tissue because your pregnancy is still extremely small and not yet well formed. However, you may experience vaginal bleeding with clots.

It’s important you observe the amount of blood loss while pregnant.

Bleeding too much may cause you to get weak, dizzy and sometimes have a fainting spell. A simple way to tell if you may be bleeding too much is if you are soaking a pad every hour, passing large clots, or feeling light-headed or faint – in these situations you should seek emergency care immediately.

You should contact your doctor, midwife or early pregnancy unit as soon as you notice bleeding in early pregnancy so that blood tests and an ultrasound scan can be arranged to check if the pregnancy is still developing normally and to rule out an ectopic pregnancy.(Cleveland Clinic – Threatened Miscarriage)

If your blood group is Rhesus D negative (often written “Rh negative”), your doctor may recommend an injection called anti-D immunoglobulin after bleeding, miscarriage or certain procedures, to reduce the risk of problems such as Rhesus disease in a future pregnancy.(NHS – Rhesus disease prevention) This is usually not needed if you are Rhesus positive. If you are unsure of your blood group or your partner’s blood group, it is important to talk to your doctor whenever you bleed during pregnancy, because local guidelines about anti-D can vary.

2. Abdominal cramps

Abdominal cramps four weeks into your pregnancy (or while you are expecting your period) may indicate you have implantation cramps or that your next period is coming (if you’ve not yet confirmed pregnancy).

After fertilization and implantation, you may experience light cramping pain that occurs about 3–7 days before your period.

Pregnancy-related cramps are often mild and short-lived.

On the other hand, miscarriage pain can be more severe, and women will usually experience bleeding too.

If you’re pregnant and have mild cramps, it is usually not an issue unless you also notice bleeding or the pain becomes strong, one-sided, or is associated with shoulder pain, dizziness or fainting. These more severe symptoms may be a sign of an ectopic pregnancy and need urgent medical attention.(ACOG – Early Pregnancy Loss)

3. Absent pregnancy symptoms

At four weeks some women will already have pregnancy symptoms. Others may feel very little.

If you suddenly feel “less pregnant” and also have vaginal bleeding or cramping, it’s important you get yourself checked.

After a miscarriage, your body will stop producing HCG hormone as it falls over weeks to pre-pregnancy level.

In fact, your doctor may ask you to check your HCG level over several days to determine if it is rising appropriately or falling.

According to the American Pregnancy Association, at 4 weeks of pregnancy, HCG level ranges from 5–426 mIU/ml. A single value is less important than the pattern: rising levels generally suggest an ongoing pregnancy, while falling levels suggest a pregnancy that is failing or has already miscarried.

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What causes miscarriage at 4 weeks?

1. Chromosomal abnormalities

During fertilization of the embryo, genetic materials are exchanged from your egg (released during ovulation) and your partner’s sperm. This enables your baby to have genetic characteristics from both parents.

However, sometimes an abnormal number or structure of chromosomes occurs during fertilization. If this happens, your body often responds by causing a miscarriage. In early pregnancy loss, more than half of miscarriages are related to chromosomal problems in the embryo.(NCBI – Early Pregnancy Loss)

At 4 weeks, chromosomal abnormality is the most common reason you will have a miscarriage.

2. You are smoking during pregnancy

Smoking mothers are at risk of losing their baby. This is because cigarette chemicals – including nicotine and carbon monoxide – can interfere with blood and nutrient supply to your baby.

If this happens, it could easily cause a miscarriage. It’s important you also stop smoking if you are yet to conceive. Women with a history of smoking have an increased rate of miscarriage when pregnant.(Mayo Clinic – Miscarriage causes)

3. You have diabetes, hypertension or an infection

It’s not uncommon for women to be diabetic or hypertensive; if you are, and these conditions are poorly controlled, they may affect your pregnancy.

Also, some infections – for example chlamydia, gonorrhea, syphilis, and certain viral infections like rubella, parvovirus or cytomegalovirus – have been linked with an increased risk of miscarriage. Many early miscarriages, however, happen without any clear infection being found.(NCBI – Early Pregnancy Loss)

Always make sure you talk to a doctor if you notice an abnormal symptom while pregnant.

4. Other causes of a miscarriage are

• Excessive use of caffeine (more than about 200 mg daily – roughly 2 cups of coffee)

• Taking alcohol while pregnant

• Drug abuse (for example cocaine)

• Trauma to your abdomen during pregnancy

• Very strenuous, unaccustomed exercise

Most everyday activities and light to moderate exercise do not cause miscarriage.

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What are miscarriage rates at 4 weeks?

If you are bleeding at 4 weeks pregnant, it’s important you differentiate period from implantation bleeding.

At four weeks, the risk of miscarriage is still relatively high because the pregnancy is just beginning. Overall, about 10–20 percent of known pregnancies end in miscarriage, and when very early “chemical pregnancies” are included, some research suggests that more than 30 percent of all pregnancies end in miscarriage.(ACOG / NCBI, Mayo Clinic, March of Dimes)

If you’ve not had any symptoms of a miscarriage, then there is no need to worry. As your pregnancy progresses, especially after a heartbeat is seen on scan, your chances of having a miscarriage will decrease.

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When Can I try again?

If you already had a miscarriage at four weeks, you may get worried about getting pregnant or going through physical and emotional stress again.

While it is advisable you take your time to prepare for your next pregnancy emotionally, research shows there is no medical need to delay trying again after an early miscarriage unless your doctor advises otherwise. Some studies even suggest that conceiving within the first 3–6 months after an early loss does not increase the risk and may be associated with a lower chance of another miscarriage.(Schliep et al., 2016, Tommy’s – Getting pregnant after miscarriage)

So don’t panic, talk to your partner and your doctor, and try again when you feel ready.

Good luck.