when to be worried about your period
If you are regular, it's easy to calculate, take menstral period minus 14 days. For a 28-day cycle, it's 28-14=14 days after the first day of the last menstruations. Sperm can live up to 5 days in the tubes and the ovum can take up to 48h to journey down. So be worried 5 days before ovulation day to 2 days after. If you are irregular, please consider alternative contraception.