5 Weeks Pregnant With Twins: Symptoms, Belly & Ultrasound

Read about pregnancy symptoms, ultrasound, belly & baby size from week 4+0 to 4+6. You're now 5 weeks pregnant with twins.

By Kate Phillipa Clark

You might not know that you’re 5 weeks pregnant with twins yet, but some women will be able to test positive if they take a pregnancy test at this point. When you are 5 weeks pregnant with twins, your body has already begun to produce the “pregnancy hormone” Human Chorionic Gonadotropin (hCG). Pregnancy tests are designed to detect this hormone, when your HCG level is at a sufficient high. You start producing hCG from the moment the fertilized egg attaches to the uterus. Your level of hCG will rise throughout a successful pregnancy, especially in the early stages of pregnancy.

When can I test for a twin pregnancy?

You can do a test on the date you are expecting your period, if it’s missing. However, if you wait a few days, the result is more likely to be correct. The earlier you take the test, the more inconclusive the result will be.

Can twins be detected in week 5 using ultrasound?

If you are having dichorionic diamniotic twins (di-di twins) – which means that they have their own separate sacs and each have a placenta – they can be detected in week 5. A sonographer specialist might be able to detect the two sacs if you’re up for paying for an early ultrasound scan at 5 weeks. If you’re having twins that share a placenta – called monochorionic diamniotic (mo-di) or Monoamniotic-Monochorionic (mo-mo) twins – you have to wait 6 full weeks. Read more about how early you can detect twins.

5 weeks pregnant with twins symptoms

You may think that you’re pregnant with twins if you experience exaggerated pregnancy symptoms. Those are often associated with twins, because substantial hormonal changes caused by elevated levels of hCG in the blood can cause more severe pregnancy symptoms. However, this can also happen if you carry a singleton. Some women will experience twin pregnancy symptoms, when they are 5 weeks pregnant with twins, whereas others won’t yet. It’s different from woman to woman and pregnancy to pregnancy.

  • The most obvious pregnancy symptom is a missed period. Be aware that you can experience spotting around the time of your period and still be pregnant. This is because, during pregnancy, hormones prevent your period from occurring. Sometimes, if the hormone levels are not yet high enough to stop your period, you’ll experience spotting. Wait a few days and see if it develops into menstrual bleeding.
  • Another early twin pregnancy symptom is sore breasts. Your breasts may also feel heavier or fuller.
  • Many women report experiencing morning sickness symptoms early when they are expecting twins. Research shows, that women pregnant with twins experience more of these symptoms than women carrying singletons. You are also more likely to have morning sickness if you carry at least one girl.

Baby size & twin belly development

Three important layers are developing, when you’re 5 weeks pregnant with twins. They each give rise to different body parts. These are parts like teeth, nails, hair, reproductive organs, central nervous system, blood, veins, the skeleton, airways, intestines, urinary tract, lungs and liver. Also, the neural tube closes and the upper part begins to develop into craniums. A part of the yolk sac from the egg(s) is confined and is the beginning of the umbilical cord(s). They will soon begin to transport the blood with oxygen and nutrients from you to your babies. The fetal parts are at this point called embryos. The embryos are formed like small tadpoles. You may feel a bit bloated, but you won’t have a baby bump to show yet. However, you will show sooner than if you were carrying a singleton. Look at other women’s twin pregnancy bellies.

5 weeks pregnant with twins

Pregnancy diet, nutrition & prenatal vitamins

You’re hopefully already taking a folic acid supplement. Ideally, you should begin taking folic acid a month prior to you getting pregnant. If you haven’t started yet begin as soon as possible. You need to take 400 micrograms (mcg) for the first 12 weeks of pregnancy. Folic acid is a B vitamin, and folic acid supplements are 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. Don’t take a larger amount than recommended because you may have missed a few weeks. Speak to your doctor if you’re worried or unsure about how much you should be getting. 


Previous week – 4 weeks pregnant with twins 

Next week – 6 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.


  1. Kate Phillipa Clark / 20. June 2018 at 5:12 am /Reply


    We’re thinking of you and your twins and hoping for the best!
    We’ll share your comment in our Facebook forum hoping someone who’ve experienced this can help. In relation to your blood work, it’s good that you’re numbers are still going up. How far along were you when you reached 27,647?


  2. Rachel / 19. June 2018 at 8:57 pm /Reply

    Hello, I have been bleeding every other day light pink sometimes darker pink mild cramps. When I found out I was pregnant I had terrible lower back aches. I went to er at 5 weeks 1 day and had ultrasound done and was told I was possibily carrying twins due to having two sacs. I’ve also had blood work done at 5 weeks 2 days with levels at 11,480 and again today with levels at 27,647. Has anyone experienced this? I don’t have appt until Friday which is 3 days away. I am really praying for twins and for them to be healthy. TIA

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