Bladder pain from sex???

So I’ve been experiencing bladder pain and pressure for months, it seemed like it was a UTI but all my tests my doctor ran were negative, could it be related to a sex injury? My boyfriend is very well endowed and we have vigorous sex that sometimes gives me discomfort but idk if that’s because of the sex or another condition, the doctor said it’s also possible I have uterine fibroids, I’m going back in for an ultrasound and blood test in the next few days but I wanna know if anyone can relate or if anyone has an idea what’s going on with me.