While we're all different, there are common physical changes during early pregnancy that many of us share. Find out more about normal physical changes and what you can expect during early pregnancy. What are the early pregnancy signs and symptoms that you can expect when you're first pregnant?
Conception usually occurs about 2 weeks before your next period would have been due (or about two weeks after the start of your last normal period).
However, it takes about 6 days for your newly conceived baby to reach your uterus from your fallopian tube, and further 6 days for them to fully implant in the lining of your uterus, to start 'interacting' with your body. This 'interaction' involves your body providing your baby with nourishment through your blood stream, as well as your baby producing hormones that move into your body to support the pregnancy.
Once the baby fully implants, they start to release a hormone called human gonadotrophin hormone (or HCG) into your blood stream. The HCG level starts off very low, but the concentration rapidly increases on the following days to produce physical pregnancy signs in the woman. (HCG levels also provide the basis for detecting a pregnancy with a pregnancy test.) This is the reason why early pregnancy signs do not start to become noticeable until around the time the woman's next period would have been due (or 12 to 14 days after conception). In many cases, a woman will not notice any signs until 1 to 2 weeks after her period was due (or 5 to 6 weeks of the pregnancy), when the HCG level is sufficicently high enough to affect her body.