Chances of getting pregnant while having unprotected sex (didn't ejaculate inside) first day of menstrual cycle?

Low but real. Before ejaculation, men produce a per-ejacualte that can contain sperm which can get a girl pregnant. Even though it is the first day of her cycle, their is a low probability that she can still get pregnant. A woman's cycle pattern is unpredictable, and she might even stop menstruating after the first day.

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