What Are The Side Effects Of Loestrin?

Hello my name is kristina and i have recently found out i have polycystic ovarie syndrome and my gyno put me on provera pills for ten days then had me start Loestrin. I got my period the next week for about a week and a day...now it has been about 4 days since my period ended and i had unprotected sex two nights ago and today i started bleeding like i have my period again....what does this mean?