Pregnancy Calendar - Week 5
Your baby's heart begins beating this week and an amniotic sac is being developed, while the placenta is still also being developed at this point. There are the beginnings of a brain, and the cardiovascular, nervous and reproductive systems. For all this rapid development, your embryo is still only about 2mm long...
By now, you may have a confirmation that you're pregnant. Your breasts may be tender, and you may be experiencing morning sickness as a result of an increase in hormone production. Your digestive system is now slowing down to ensure that all the nutrients possible reach your baby.