thanks for using health care magic
I want to believe you did take the morning after pill in order to prevent an unwanted pregnancy
. If that's the case then you should be re-assured you can not get pregnant by having sex on the first days of your cycle and definitely you can not be pregnant unless you became pregnant the month before and did not know. However, a simple pregnancy test could be necessary to be fully sure.
Emergency pills are hormone based and they are known to cause small irregularities in the menstrual cycle of women including delay or early menses, heavy bleeding or reduced bleeding and cramps. However, these irregularities are just for a couple of cycles.
If the bleeding persist or is abundant you should consider seeing your doctor.
Hope this helps you.