Hi! My period started on 11th may last month.i had sex with my boyfriend on 18th may night. Took the Ipill on 19th afternoon( which is less than 24 hours) . Started bleeding on the 31st may that is 12 days after the pill. Had very very light bleeding for 3 days till 3rd June. I have a 25 day cycle usually or sometimes 30. Can I be pregnant? Is that withdrawal bleeding or implantation bleeding?