Cramps, but no period

D🖖🏻
Today is Monday. Since Thursday I have had on and off period cramps, but no period. 
I am sexually active and I have PCOS. I was off birth control for three months (doctor's discrepancy) but started taking it again Wednesday. Partner and I used other methods of protection while I was off birth control. 
Has anyone else had this happen? It's pretty unpleasant.