The second trimester.

The second trimester of pregnancy spans from week 13 to week 27. This is when most women actually start to appear pregnant. By week 16, the top of your uterus (the fundus) will be about halfway between your pubic bone and your navel.  During this time, many women feel better, both physically and emotionally. The worst of morning sickness has passed. The baby is growing, but hasn’t become large enough to crowd your organs. Overall, it’s a time when women often feel at their best during pregnancy, as major changes – both to their body and their baby – are just around the corner.

What To Expect Your Baby's Development Tests and Screenings