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 <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, 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