7 days before period cramping and then it stopped

I just dont get. Woke up 2 days ago with insane cramping. Usually the type of cramps I will get on the day of AF. It was there for about a day and then in it was gone. I had a weird feeling in my low abdomen area. No spotting. Nada. No sore boobs. I really thought that i might be pregnant. Now im worried what that cramping was. AF due in 4 days.