Hi so I was at a party on Saturday the 4th but I can't remember if I had sex or not that night. It was during my fertile window. Then around that Wednesday I started getting little pains in the side of my stomach like in the middle of my vagina and stomach. Then my boobs started getting sore like around my nipples and swollen. I've been feeling a little nauseous and not hungry. Also having headaches and a little back pain. Usually my boobs hurt a couple days before my period but this was different. It hurts to wear a bra. It also hurts to lay on my stomach and now around these past couple days I've been feeling pressure and a little cramps but I'm not supposed to start my period until Friday. Does it sound like pregnancy or something else serious ?