Hello, this is my first post just looking for some assistance. I started my period today with a lighter but normal flow but it only lasted a few hours then stopped. My bf and I sex on Nov 15th a day before my last period which lasted 16-20. We had sex again on the 30th and the 4th. I've been having nausea, vomiting, weird cravings but I can't be pregnant and my period started. Could it be something more serious .