 [ Symptoms ] i took my last birth control pill a day late last month and had intercourse that same day i missed could i be pregnant i was supposed to take my last pill on saturday the 22nd of september but forgot and took it on sunday the 23rd i had intercourse with my husband on saturday the 22nd i got my period a day early on tuesday the 25th and it was light and short is it possible that i could get pregnant that close to my period starting please help [ Disease ] an average menstrual cycle is 28 days first day of the cycle to the next menstrual cycle however a normal menstrual cycle can range from 21 days to approximately 35 days if your daughter is relatively young then this may be normal for her some women do not regulate their menstrual cycles until their late 20 is the concern with very long cycles is that ovulation egg release may not be occurring which could cause infertility there are several reasons for long cycles one of which may just be young age your daughter should see a gynecologist just to make sure everything is okay