I NEED HELP

So really just wondering if I'm pregnant I've gotten several negatives but I have that feelings honestly. I dtd 2 days after my (very very very irregular ) cycle ended. No bc, no condoms. I threw up 2 times , I'm hungry but nauseous, I cannot sleep, my head hurts, I have cramping but not like regular cramping (which started 2 days after we had sex) I can never tell when I ovulate. I'm going to birth right to get tested on Thursday because I've been receiving negatives! I would love a child but this isn't planned at all. HELP , can I know this early? It's been 12 days since we had sex. I don't know when my period would come so I can't wait til I miss my period.