SCARED😳TMI!!!

Riviera • Mama of 1
Okay ladies... I have unprotected sex last Monday. My period was supposed to come the following Sunday. But it never came. Today I've felt like crap. I threw up and had a migraine all day. I am now 3 days late. May I add that the end of my ovulation I had unprotected sex. Is it possible I'm pregnant? Is this implantation? Please helpÂ