Pelvis, spine, or hip problems??

So this happened to me back when I was only 7 weeks pregnant for the first time in my life and this is my fourth pregnancy. It started when I was putting leggings on..squeezed my butt cheeks and pushed my hips forward to get them on and a nerve hit and was sooooo painful. It was like if you have an open nerve in your tooth but in my lower spine. The pain happened only when moving, walking, bending, rolling over, transitioning positions. After a week it got increasingly worst to the point where I went to the er, and because unable to move period. It resolved itself after a month and a week.. now this pain is back..except it hasn't reached a point of making me immobile just yet. But I can assure you I'm not going to be able to work up to my due date..after 30 minutes of standing it locks up and causes the sharp stabbing pain. Last night I looked in the mirror and my whole back/stomach is sideways..the only way I can make one side even with the other is bending a leg.. and it can't be due to baby getting bigger because this happened back when I was 7 weeks pregnant due to an injury..putting leggings on. Anyone else ever deal with this?