Pelvic discomfort

I had my 20 week ultrasound on Friday and she's healthy and right on schedule and everything but she is sitting right on top of my cervix. My doctor said she is is breech position but not in a bad way cause there is plenty of time for her to move around before it's go time. But my doctor pointed out the reason I feel pressure this early on is cause she's little rally bouncing and rolling and all her movements are already pushing down on my cervix cause of her position. 

My doctor recommended sitting if the pressure got bad but that was it, anybody else have any ways to alleviate it a bit? I have an active 2 year old and an already walking nine month old so sitting a lot is not the greatest option