Hi and thank you so much for this query. I am so sorry to hear about disturbing information about plan B and the risk of pregnancy. Plan B is effective irrespective of the stage of the cycle. it does not only work by inhibiting ovulation but also causes bad conditions in the uterus making implantation difficult. There is nothing else to be done and you should not be worried. Also, talk to your doctor about adopting and using a regular method of contraception as well as always protecting yourself during intercourse because it also helps guard against STDs. I hope this addresses your query fully. Thank you so much for patronizing our services and please do feel free to ask for follow up clarifications and information if need be. I wish you the best of health. Dr. Ditah, MD.