Possibly, but probably not very likely. If you started on day 1 of your period, you would only have had sex on day 5 of your cycle. Chances of ovulation are slim, but not unheard of. I recommend using back up protection for the first month, to be on the safe side, but some work within 7 days or a couple of weeks.
The reason they say day 1 starters don't need back up is because generally the body ovulates on days 12-16 of your cycle, give or take, so the pill would be effective by the time that happens.




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