My anxiety is getting bad

I am nauseous right now I haven’t eaten since 3 and it’s now 9pm I can’t even think about eating tho. I have been overthinking so bad I had sex 2 weeks ago with a condom, he pulled out not even being close to finishing and I’m on the pill. I also had sex about 4 days ago the same way protected and everything but the twist is that I was taking antibiotics this time which make me nervous with the pill. But we still used a condom and he pulled out. I freak myself out and get very anxious and I am running on 4 hours of sleep from last night I couldn’t even sleep. Can someone please give me some reassurance that I am not pregnant