Well in my experiance it was just due to the hormones. If you are too worried about it check in with your Dr. Or give it a month or two and see if it goes away. If the bleeding starts to get really heavy then I would check in with your Dr. to make sure everything is ok.
No I'm not bleeding heavy, never really was a heavy bleeder on my period it's just like a normal period just every 2 weeks
The same thing happend to me after my 3rd child. My Dr. said that it was just my hormones all messed up and they needed time to get themselves back to normal. It took my body about 5 months to get all the hormones back to normal.
I wasn't on the pill though.
Are you bleeding heavy? You want to be careful that you are not losing too much blood. You don't want to get anemic. You might want to give you Dr. a call and see what he thinks.