Pain During And After ?

I've been to the doctor twice about this and im still not sure whats going on. This problem started years ago which my second ual partner, Which i just put up with. I also had the same pain with the partner i am with now, but all of a sudden it stopped for months and i started to enjoy again. then since i found out i am pregnant the pain comes back again! ive got no infections, as ive given swabs and urine samples, i no its not down to lack of lubricant, nore is it the bubble bath i use as i dont use that at all. im stuck with ideas as to watch causing this pain. its causing problems with my partner as he's starting to think i don't want and have gone off of him. I want i just don't want the pain. anyone got any ideas?