I Have Been Taking Nortripiline For The Last Week. I

I have been taking nortripiline for the last week. I have also been taking the birth control pill AVA. I have had my period for a week now even though i am not taking the sugar tabs, it is heavier for linger than i normally would have. Normal for me is a max of 4 days. Not day 7 still bleeding a bit. Is it the nortripiline causing this?