Could I be pregnant

Me and my boyfriend had sex a couple of days ago and it turns out I was ovulating. We’re both young and stupidly weren’t very careful. I know its probably too early to tell but recently I’ve had some unusual things happen that I’m not really sure about. Recently I’ve had to pee often, I can’t get full, my stomach hurts, and felt a little nauseous. I’m sure I’m probably worried about nothing but some other opinions would be nice.

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