Worried

So recently I lost my virginity (a little over a month ago) and I’ve already had sex three times, each with a different guy. (Sorry If i sound like a hoe) and the last time I did it I was drunk and I couldn’t tell if the guy came in me or not, but after the fact I did feel his cum on my stomach. Okay so now that that’s summed up, I have been feeling nauseous a lot lately and super tired and I’m not on the pill or anything. I’m worried there might be a chance I could be pregnant, or maybe it’s just a side effect from drinking so much alcohol ??? Advice/thoughts would be greatly appreciated.