I am changing my usual birth control and there was an accident so I took plan within 3 hours. I did not bleed after a week of taking plan b and my period is due on March 10th. My usual cycle is 28 days long, lasts just 3 days. So I had sex on the 21st and my last period started February 10th and ended on February 13th. I read that Plan B only works if one did not ovulate. So I wanna know how likely I am to get present and I am freaking out as my nipples are sore and breasts are tender.