BC and Periods

Brandy

so this is strange to say, but my fertility specialist recommended i try birth control for a few months to see if it will help with some pretty intense ovarian pain and cysts before resorting to surgery, so my question is : I am on loestrin FE 10. I started my cycle on 8/10, and started my pack the same day as per instruction. well, here we are on 08/18, and I am still bleeding. is this normal? should I be concerened? I haven't taken BC in 14yrs.