Suggest Remedy For Cramps And Bleeding After Taking Plan B

I took plan b about the same time of ovulation (may have been a day before or same day or the day after) after a small amount of cum came in contact with my vulva. For a week I had no symptoms. Then I started experiencing small cramps on no particular schedule. I started bleeding 2 days before I expected my period. It has been 3 days since then and the bleeding is lighter than usual for a period. My cramps since bleeding has started have been exactly the same as usual during my period. What is the chance of this being implementation bleeding?