What Causes Menstruation To Be Light And Unusual?

I took the morning after pill on the 26th of February, 6hrs after a condom breaking( the single dose pill). I had diahorrea a few times that day but I think it is only vomiting that effects the pill. I got my period on the 10th of March (only 2 days late) but the first two days it was just clear with an orange tinge when I wiped. 2nd two days it was brownish and stringy with a bit of red one night but very light. and by the 5th morning it was gone. I usually have very heavy periods that last 6 days plus. Just wondering if that's normal? Thanks