what’s happening?

Alright ladies! I need your help. So I’ve been having period cramps for awhile now and my period usually always comes after a few days of cramping and it’s been about a week and a half and still no blood, sometimes I feel like I am bleeding so I go and check and there’s nothing. It’s almost the end of the month and my period is usually here before then. I did get off birth control last April, someone said my body could still be trying to function without the pills, but I’m starting to worry because I cannot be pregnant. Someone help please!