Sickness

I had sex 2 weeks ago, for two days I've had symptoms like my period was coming on, but I haven't even started my fertility days, my period came the day I had sex, I have been slightly throwing up tonight like it's there then won't happen. My head hurts, I've been soooo freaking tired, my backs killing me, and I'm cramping like fuck, my boobs are a little sore as well...is there a possibility of prego