Pelvic Pressure.

Today we found out that we are having two boys instead of a boy and a girl, but more importantly, I am having some serious pelvic pressure. It doesn't hurt per say, but it is extremely uncomfortable. I have already been to the doctor and they checked my cervix and everything. I'm not effaced or dilated and my cervical length is 3.9 cm. Baby A (the one we thought was a girl) is extremely low. He is head down, and almost to the point of being engaged. His brother is breech and happily kicking his brother in the head. I'm 17 weeks today. So, it's wayyyy too early for them to arrive. My question is, does anyone have any suggestions to help move him back up? My doctor suggested getting on all fours and wiggling my hips to try and let gravity help pull him back. I don't feel like that helps really though. Any advice is greatly appreciated! Thanks!!