Am I pregnant or is this normal😂

Hi, so me and my boyfriend had unprotected sex while on my last period (we don’t usually go unprotected we just ran out of condoms and we were already in the mood😂). Usually my period lasts 7 days, we had sex on the 5th day. My cycles are all over the place lately, some are 2 weeks apart, others are 5. My next isn’t due according to this app until 2nd July. It’s been almost 3 weeks since we had unprotected sex and I’m experiencing weird changes in my body that I don’t normally experience before my period. I feel full constantly, since yesterday I’ve had a dull ache in my lower ribs and lower back, and the side of my boobs hurt like growing pains. I’m hoping this is just some new symptoms of PMS that you get as you get older, though something in my gut is saying I’m pregnant 😂 am I being paranoid?😂😂