So on March 11 this guy and I had protected sex and afterwards we checked and the condom didn’t break. It was not my first time but it was his first time having sex and so like he was stressing about it. I was suppose to start my period on March 18  but my period has always been irregular so i knew i was gonna be late. It has been two weeks since i had sex and still no period had started. I do have signs like tender breasts, back pain and cramps, and even acne though. Is it possible to have a missed period or be that late after sex ?!