How do birth control pills protect you when you’re on your period and taking sugar pills?
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So here’s the fun thing about human reproduction. Human Females can only get pregnant for a few days out of every monthly cycle (for the most part, some exceptions can occur). For most of the rest of the time the uterus may be ready for pregnancy but the egg is not present and therefore the sperm just sorta… die. Hormonal birth control pills work by tricking the body into already thinking it’s pregnant (so it doesn’t release an egg at all) or making fertilization much less likely.
So to your question, a human female having her period is in the part of the cycle where the egg is already released and gone. The uterus is closed for remodeling and the chance of pregnancy is virtually zero. So to allow the woman’s body to have a (relatively) normal cycle, you take sugar pills for those few days but there’s nothing to protect you from so it isn’t an issue.
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