Pregnant and Suspicious

My partner has been acting weird af lately. We spend so much time together that I would never guess he’s cheating but lately I got a second job and we’ve been finding clothes all over that supposedly belong to his sister (underwear, tops, etc). Our dryer broke so we would go to his parents to do laundry. So it could be that their his sisters as his sister also occasionally does laundry there but I found it weird. Then our camera stopped working and he turned it off. Now it really does act weird but I got it to kind of work, it takes screen shots if it sees movement, it’s for the dogs. And then his behavior is hot then cold. He has anxiety and seasonal depression but some days he won’t even want to touch me then others he’s sooo sweet. He’s been getting so mad at me for accusing him of cheating that he said if I do it again we are done. But I have had back to back dreams of him cheating and I just can’t shake the feeling. Well I went to the doctors to check for a UTI, they found a ton of white blood cells in my urine but no UTI.. the only other thing it could be is stress from baby or an STD. I’m only 13 weeks and the baby is so small I don’t see it being stress.