AM I PREGNANT OR WHATS GOING ON

So, last period I had was on March 9th. I had unprotected sex on the 23rd of March, he finished in me. I’ve been having headaches and feeling like passing out lately. I was supposed to start my period on the 6th of this month, I’m a day late. According to the glow app, it marked it as grey, which is unconfirmed or late. So it moved up to the 8th of April so idk what’s going on. I got cramps today. I need answers. I also have a headache rn and feel nauseous