At 15th week, your baby is about four and a half inches right now. As your pregnancy progresses, your fetus is also looking more and more like the baby. By now, the ears are positioned properly on the sides of the head (Not longer in the neck) and the eyes are moving from the side of the head to the front of the face
Diet and exercise go hand in hand so keep in mind not to even miss one day of some sort of exercise in order for your pregnancy to be fruitful.