Constant urge to pee after sex

My boyfriend & I have been experiencing this really weird symptom after sex. After we have sex we’ll both have this urge to keep peeing along with some slight burning for quite a while after. For me I usually have to pee 2-3 times before the feeling goes away, for him it tends to last him the rest of the night or for a few hours. I am pregnant so I get tested quite often. I don’t have any STD’s, no UTI, no yeast infection, nothing. I did get BV at the beginning of my pregnancy, but I got that taken care of. He however hasn’t been tested for anything, but I feel like if he has anything I would have gotten it by now & it would have come up. I know the most logical thing to do would be to go see a doctor & have him checked out, but I am wondering if anyone has had the same issue?