Where is my period!!!

Last month I got my period on the 6th. I ovulated around the 21st therefore my period should’ve came by now. I feel cramps and have acne as if my period is about to start. I spotted two days but no real period. I had sex on my ovulation days but he didn’t finish inside me. We’ve been doing this quite sometime now and I’ve never had my period be this late. I have abdominal pain as if I’m on my period but there’s no blood only feels very moist.