Extra long period

So I went off Yaz (the pill) in December 2014 and didn't have a period until this month, which several doctors and tests said was ok, just the hormones taking a while to leave my system. Now I've got my period, but I've been on it for 14 days, twice as long as before birth control, with no signs of slowing down. Large clots and extra acne are starting to stress me out. Do I need to see a doctor, or is this because of having gone so long without a period?