I get these strong, uterine Charley horse like cramps on the sides of my uterus that will literally stop me in my tracks and make me yell out in pain. They last for a few minutes and it hurts so badly that my body is completely stiff and won't relax until the pain subsides. This has been happening since the beginning of my pregnancy and I'm 25 weeks now. It usually happens when I try to switch positions while laying or trying to get up. Anyone else experiencing this?