I was wondering about the side effects of Plan B. I took it in January and about a week after I got my period for about 8 days. Since then I have not had intercourse in about a month and I am not pregnant. However, my period is late. I have read other resources online about women who experience late periods their second cycle after plan B. I just wanted to hear about others' experiences because I'm concerned my period is not here yet. I double checked and I'm not pregnant.