4 Weeks Pregnant With Twins: Early Pregnancy Symptoms

Read about early twin pregnancy symptoms from week 3+0 to 3+6. You're now 4 weeks pregnant with twins.

By Kate Phillipa Clark

When you’re 4 weeks pregnant with twins, you won’t be able to detect your pregnancy by the use of ultrasound. When six full weeks have passed (after week 6+0) you should be able to detect all kinds of twins using ultrasound.

When can a pregnancy test be taken?

You may be able to get a positive pregnancy test result, but don’t count on it. Usually it takes three to four weeks from the first day of your last period for the levels of the pregnancy hormone hCG to be high enough to be detected by pregnancy tests. The pregnancy hormone tells your ovaries to stop releasing eggs. It also triggers increased production of estrogen and progesterone. These hormones keep your uterus from shedding its lining and stimulate the growth of the placenta(s). You won’t ovulate while you’re pregnant.* This also means that you won’t get your period.

*It’s possible for a woman to continue ovulating after becoming pregnant, but it’s very rare. It’s called superfetation if a woman becomes pregnant while already pregnant.

4 weeks pregnant with twins symptoms

  • Some women might notice spotting – or slight bleeding – for one or two days around the time of implantation. This is called implantation bleeding. It happens when the fertilized eggs attach to the inside of the uterus. After implantation, the lining of the uterus gets thicker, and the cervix is sealed by a plug of mucus. It will stay in place until the twins are ready to be born.
  • Some women report feeling nauseous very early on when they are pregnant with twins.
  • Some women experience cramps similar to when you’re getting your period. The latter is not necessarily a bad sign. Wait a couple of days to see if you get your period and, if not, take a pregnancy test.

Baby size and development

Your babies (or baby)* are like two tiny balls – called blastocysts – and are already consisting of several hundred cells that are multiplying. The part that will develop into the placenta(s) has started producing the pregnancy hormone human chorionic gonadotropin (hCG). When you’re 4 weeks pregnant with twins, the blastocysts are receiving oxygen and nutrients from their yolk sac(s) until the placenta(s) is ready to take over.

*If you’re having identical twins, and the egg hasn’t split yet.

When you’re 4 weeks pregnant with twins, the fertilized eggs reach your uterus. With fraternal twins, two eggs have been released from your ovaries and fertilized by two separate sperm cells. Identical twins stem from an egg splitting in two after fertilization. The eggs will now attach to the lining of your uterus. This is called implantation.

Identical & fraternal twins

Fraternal twins have their own separate placentas, amniotic sac and outer membrane. If an egg splits within the first three days after ovulation, identical twins will have their own placenta, amniotic sac and outer membrane similar to fraternal twins. This type of twin pregnancy is called a dichorionic-diamniotic (di-di) twin pregnancy. If the split happens later the twins will share an outer membrane and placenta. In most cases, they each have their own separate, inner membrane. This is the case for two thirds of identical twins, so it’s the most common type of identical twin. This is called a monochorionic-diamniotic (mo-di) twin pregnancy. It’s possible for identical twins to share an inner membrane (amniotic sac) too, but it’s very rare and only happens in about one percent of identical twin pregnancies. This is called a monochorionic-monoamniotic (mo-mo) twin pregnancy. Twins who share a placenta are more at risk of twin pregnancy complications, so it’s very important to get a chorionicity scan early on.

Pregnancy diet, nutrition & prenatal vitamins

Eating healthy, nutritious food is important for you and your babies during pregnancy. You especially need to make sure that you get enough protein and calcium.

Which foods are good for early pregnancy?

You can get calcium and protein through dairy products, eggs, lean meat, lentils, peas, beans, chickpeas, soybeans, peanuts and vegetables such as kale and spinach. You also need to take a folic acid supplement. Folic acid is a B vitamin and is standard for pregnant women and women who plan to become pregnant. Folic acid helps prevent neural tube defects. Neural tube defects are serious birth defects of the spinal cord and the brain. You need to take folic acid for the first 12 weeks of pregnancy. Ideally, you should begin taking folic acid at least a month prior to you getting pregnant.

What not to eat when you are pregnant?

Cut down on sugar. Both in terms of candy and sugary drinks but also ready meals with added sugar. You increase the risk of getting gestational diabetes if you eat foods that are high in sugar.


Next week – 5 weeks pregnant with twins



About the Author

Kate Phillipa Clark

Kate Phillipa Clark has a bachelor in Journalism and an Executive Master in Corporate Communication. She is an identical twin and so is her father.


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