hungover or pregnant

so my period ended about a week ago. Ive had sex with my boyfriend multiple times since then. we don’t use condoms but he never finishes in me and I’m on the pill. the past few days I’ve been having some weird cramps on my sides kind of where my ovaries are and today I can’t eat because I’m so nauseous. this isn’t normal for me. last night was nye so I got pretty drunk and I think I might just be hungover but I’m worried I could be pregnant because I’m always paranoid about it lol. is it possible to feel pregnancy symptoms a week after you’ve had sex or did I just drink too much 😂 thanks in advance lol 💕