Technically no, but it depends on when you ovulate - sperm can last in the uterus for up to 5 days, and if you ovulate very early in your cycle, then it is technically possible to fall pregnant. But highly unlikely. Average cycle is 28 days long, the first day of your period is the first day of your cycle, so if your period is 5 days long and you have sex on the last day of you period, the sperm can live until day 12 of your cycle. Most women with a 28-day cycle will ovulate on day 14 of their cycle, so you can see how it could be possible to fall pregnant during your period. You usually ovulate 14 days before the start of your new period.
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