Help! Weird cramps and other symtoms

I had sex (with condom) a week before my ovulations was supposed to happen and I am supposed to get my period in 9 days. But ever since the day I had sex, I’ve had weird cramps in my lower abdomen (lower than it hurts when I have my period and switches sides) and back. In the last week I also started having heartburn, diarrhea and a lot of gas. Yesterday my breast started hurting a bit. I’ve had normal discharge (clear, somewhat watery, and a little).

I think I might be overthinking it, but is it possible to be pregnant? I’ve had the cramps since before I ovulated and the rest could be stress related (work) and normal PMS?