Prego or no prego

Alena

I had sex the day before my period and the day after my period and then 3 weeks go by and I started noticing that I was having pain in my stomach and then i was spotting and now it feels like I’m on my period, but when I stand up I black out for a min so its like being light headed, but it happens all the time now since I started spotting. I need help!!!