This phase of your pregnancy should be quite pleasant, as all the uncomfortable early pregnancy symptoms will likely disappear and your belly will not yet have grown big enough to cause you discomfort.

Your uterus has now moved about half an inch above your navel. You have possibly gained around 5-7 kilos by now, and people around you may have started noticing your baby bump. You will begin to experience some itching due to dry skin this week and in the weeks that follow. Your feet may swell a little in the weeks to come. The veins in your legs may become prominent, indicating the onset of varicose veins. However, in most cases, it is possible to avoid swollen feet and varicose veins by taking the right precautions (read on to know what these are).
Your baby continues to swallow amniotic fluid, and derives nutrition from it. The digestive tract continues to mature too. If you are having a little girl, her vagina has fully developed by now, though it will continue to develop further up until her birth.
10.5 inches, or the size of a carrot.

At 21 weeks, this phase of your pregnancy should be quite pleasant, as all the uncomfortable early pregnancy symptoms will likely disappear and your belly will not yet have grown big enough to cause you discomfort. You will begin to experience some itching due to dry skin this week and in the weeks that follow. Your feet may swell a little in the weeks to come.
At 21 weeks, you may even feel movement by placing your hand flat on your belly. You will feel that the baby is moving inside, but may not be able to identify a turning around movement.
At 21 weeks of pregnancy, your baby continues to swallow amniotic fluid and derives nutrition from it. The digestive tract continues to mature. If you are having a little girl, her vagina has fully developed by now, though it will continue to develop further up until her birth. The baby is still in the developing stage and will continue to do so for a few more weeks.
When you are in your 21st week of pregnancy, you are in the 5th month. You are just over halfway through the pregnancy period, with the 6th month beginning around the 24th week.