Preggo?

So I had sex about 3 weeks ago with a condom. I'm supposed to start my period tomorrow but I've had no symptoms, I spotted about a week ago a couple times and I've been a little nauseous here and there. Mild cramping. Few hot flashes. Could I be pregnant or am I psyching myself out? I usually get sore breasts, crazy cravings and super horny before a period but none of that has been happening. I mean we were very drunk but the condom was still in tact(as far as I know) Helppppp