This is tricky, because there is potential ambiguity in the phrasing of the assertion. In other words, whether or not a woman can get pregnant during her period depends on the precise question asked. “Can a woman get pregnant during her period?” is quite different from, “Can a woman get pregnant from intercourse during her period?”

A woman can NOT get pregnant during her period because the hormonal levels that trigger ovulation are completely opposite during menstruation.

However, a woman CAN get pregnant from intercourse during her period if she has an early ovulation and has sex on Day 5 or later of her cycle.