Am I pregnant?

So I had my period 3-8 of this month and had sex the 14 and 15. He did cum in me a couple times. The last couple days I wake up with a headache then it goes to just being dizzy threw out the day. I get nauseous throughout the day. Get weird adonibal pain not like my period cramps. I have big boobs but they feel heavier. On this calendar it says I'm supposed to start the 22nd which seems kinda soon. The other one I have says July 1st. Could I be pregnant?