3 weeks pregnant: Pregnancy health information

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smiling couple at doctor's office
smiling couple at doctor's office
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Doctor’s appointments and tests

Infections such as sexually transmitted infections can interfere with the processes through which the group of cells which will grow into your baby, the blastocyst, implants itself into the wall of your uterus. It’s important to check for sexually transmitted infections like chlamydia which may have no obvious symptoms, before you conceive, as part of preconception care. For more information about preconception care see Pregnancy Planning.

Health and lifestyle tips and information

The first week after conception is a time in which your pregnancy has not yet become stable, and is very vulnerable to miscarriage. Consumption of dangerous substances such as alcohol, caffeine medicines, illegal drugs and tobacco all interfere with the process of blastocyst implantation so it’s important to avoid these substances, even before your pregnancy is confirmed. Failure to implant properly will cause a miscarriage. Even in the healthiest women, miscarriage remains very likely in the first week after fertilisation.

Can exercise affect implantation?

Can exercise affect implantation? The short answer is ‘no’, unless you’re doing very intense exercise like training for a marathon.

Exercise affects fertility both negatively and positively. Normal, moderate intensity physical activity has a positive effect and reduces the risk of conditions like obesity which are associated with infertility and improve the functioning of the ovaries. However, intense exercise, such as training for a marathon or as a professional athlete, can have a negative effect on fertility. In addition to implantation failure, fertility can be affected by your menstrual cycles, your partner’s sperm and many other things.

Few studies have looked specifically at infertility underpinned by failure of the blastocyst to implant in the lining of the womb, however available evidence suggests that normal, moderate physical activity will not affect the likelihood of implantation. Very intense physical activity and physical strain may increase the risk of implantation failure by up to 2.5 times.


More information on the 3rd week of pregnancy

For more information on the third week of pregnancy, see 3 weeks pregnant.
For more information about the changes that occur when pregnant, see Changes to mum this week.
For more information about what happens to create your growing baby after conception, see Changes for baby this week.
For more information about the key points on the third week of pregnancy, see Key points this week.
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Date Created: August 22, 2012 Date Modified: August 29, 2012