6 Weeks Pregnant With Twins: Symptoms, Ultrasound & Size

Read about pregnancy symptoms, sex during pregnancy and ultrasound from week 5+0 to 5+6. You're now 6 weeks pregnant with twins.

By Kate Phillipa Clark

When you’re 6 weeks pregnant with twins, your babies are going through an amazing, intensive development. You may also be experiencing some twin pregnancy symptoms. You should get a positive reading on a pregnancy test if you take one during this week of your pregnancy.

Baby size & development

Your babies measure about 0,5 cm, when you’re 6 weeks pregnant with twins. This is from head to rump. In the first few months of your pregnancy, your babies will be measured from head to rump – named crown rump length (CRL). Crown rump length is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump). Babies are measured this way, because it’s difficult to measure leg length at this point. Later in your pregnancy, your babies will be measured from crown to heel – this is the equivalent of standing height in older persons. Your babies hearts are not fully developed yet but are being formed.

Ultrasound at 6 weeks pregnant with twins

At an ultrasound scan at 6 weeks, a sonographer will most likely be able to spot two sacs if you’re expecting twins with separate placentas. From next week, when 6 full weeks has passed, they should be able to spot twins that share a placenta. Twins that share a placenta are called monochorionic twins and are detected via their heart beats. Read more about dichorionic and monochorionic twins.

Ultrasound & chorionicity in twins

It’s extremely important that you find out what your twins chorionicity is. Chorionicity relates to whether or not your twins share a placenta. Twins who share a placenta are called monochorionic twins and are more at risk of twin pregnancy complications. Some women are still being misdiagnosed or are not being told about the importance of correct determination of chorionicity at their ultrasound scans.

6 weeks pregnant with twins symptoms & belly

Don’t be alarmed if you’re 6 weeks pregnant with twins and don’t feel any changes in your body yet. It’s very different from woman to woman and pregnancy to pregnancy how and when your body reacts. Some will experience pregnancy symptoms like:

  • Sore or tense breasts
  • Fatigue
  • A bloated belly. You’ll start showing sooner with twins, especially if you’ve had other children previously.
  • Increased need to urinate. This is due to the increase of the hormone hCG. It increases the blood flow to your pelvic area. Be aware that the risk of developing cystitis is increased when you’re pregnant. If you are unsure whether you have cystitis, contact your doctor.

twin pregnancy belly

Sex & being pregnant with twins

Having sex can’t hurt your babies. Your babies are well protected in the womb surrounded by fetal membranes and water. There’s never direct contact with the babies. However, you may experience a little spotting from the cervix when you have intercourse. It’s quite normal and happens due to increased blood supply to the cervix and vaginal walls during pregnancy, which means that blood vessels are more likely to break during intercourse. If this worries you, or you are experiencing more than a little spotting, contact your doctor.

Does sexual interest change during pregnancy?

Yes. It’s normal that you and your partner’s desire for sex will change during pregnancy. It’s normal to have more or less sexual interest at different stages of a pregnancy. Some pregnant women and/or their partners feel uncomfortable having intercourse because of the notion that the babies are present. Some pregnant women also experience decreased sexual interest due to fatigue, nausea or other related symptoms. Talk to your partner about how you feel and ask about your partner’s feelings and desires. Being able to talk about this constructively will contribute positively to your relationship.

Pregnancy diet, nutrition & prenatal vitamins

Eating healthy, nutritious food is important for you and your babies during pregnancy. Drinking lots of water and stopping or cutting down on sugary drinks is a good idea too. You also need to take a folic acid supplement. 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. You need to take folic acid for the first 12 weeks of pregnancy. 

What not to eat & drink when you are pregnant?

The sensitivity for negative side effects of alcohol, tobacco and certain types of medication is great in the days and weeks to follow. Speak to your doctor about use or misuse of any of these substances. You may be able to change to a different brand of medication that will be better for your pregnancy. You may also be able to get some help with any dependency that might be harmful to you or your babies.


Previous week – 6 weeks pregnant with twins 

Next week – 7 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. Carolyne Spackman / 1. July 2018 at 4:16 pm /Reply

    Folic acid as a supplement is harmful. People should be taking l-methylfolate, the natural, methylated form. This is especially vital for those with mthfr gene defects which is about half the population. Eating foods fortified with synthetic folic acid causes high levels of un-methylated folic acid to build up in the body which is not only useless, but it prevents the active l-methylfolate from being available. Please, please, please make an adjustment to your blog about this because too many people are actually getting no protection against birth defects and in fact are building up harmful levels of folic acid.

    • Kate Phillipa Clark / 2. July 2018 at 5:46 pm /Reply

      Hi Carolyne,

      Thank you for your comment. The World Health Organization as well as the American Pregnancy Association (and many other associations) strongly recommend daily folic acid supplementation as part of the antenatal care. Could you refer to the research you base your comment on (in relation to folic acid being harmful as a supplement)?

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