i had sex and took the MA pill just as a precaution. a few days later i bled for about 4 days (which didnt worry me too much as i figured it was a side effect). i went to the dr and got yasmin to take the first day of my next period which was due in 3 weeks.
2 weeks after my period was due i still didnt have it so i took a hptest and went to the doctor for a pregnancy blood test which was negative. a week later i started having back pain and cramps here and there and assumed my period was coming. a few days later i started bleeding and took my first yasmin, but the bleeding is very light and kind of stops and starts. today is my second day of bleeding and im wondering if this is even my period? also my cramping and other symptoms are nowhere near as bad as normal

i guess my questions are..
is it reasonable for my period to be much lighter and off-and-on?
should i not ahve started yasmin (cos it could screw up my hormones more)?
is this even my period??