When your joints begin to relax in preparation for childbirth and also when your baby drops during the third trimester, you may experience a feeling of constant heaviness or pressure in your pelvic area. Swimming or being in the water, if possible, can temporarily relieve some of the pressure, along with soaking in a cool bath or applying a cold pack. Continue with your Kegel exercises, to reduce soreness and look into a maternity support belt, to alleviate pressure.