Hi doctor, I had unprotected sex july1st and got my period July 3rd or 4th. After my period my stomach was really hurting me and felt nauseous. Yesterday I finally went to the doctor for a check up and for a urine test for pregnancy and it came out negative. But I was diagnosed with gastritis. My boobs do hurt tho. Not a lot, I can still lay on them but when I press on a side it hurts a little. Could I be pregnant ?