I guess this is one of the side effect of this pill. It is normal I think. Still ask your doc just to be on safe side.
Why Am I Having A Heavy Period Lasting Over A Week After Taking Norethisterone Tablets?
It took me 3months for my period to become regular again and it came back heavy with a lot of cramps and pains. I avoid going on norethisterone at all times because it is a nightmare when you come off of it again!
You are going to be out of whack for at least a good 3 months after changing or starting the pill. Tis life...