A friend and I had become pretty intimate. No intercourse just genitals very close to each other when we decided to stop. I had just finished my period. I was worried and took Plan b 36 hours later. After 4 days, I had a light flow followed by a heavier bleeding. This lasted for 3 days. I understand it could be a withdrawal bleed. Is that a normal duration suggesting that Plan B has possibly shed the lining?