Cramps

According to Ovia, my period was supposed to start yesterday. Still no sign of it. Glow says 4 more days. Mid-cycle and until 9dpo (11dpo today) I had cramps like I was for sure going to start my period!!!! Spotted three different days. Little brownish spots, maybe 2 drops each day. This is something I've never expierienced! I've also never been pregnant. I had sex during fertile window and my boyfriend came inside me, not trying to conceive. Had a nasty taste in my mouth for 2 days, and now it's gone. I'm expecting my period but don't know if it's going to come...the mid cycle cramping seriously felt like a period. No cramps now. Nothing but big boobs.