It depends on how ur body works. Everyone immune system doesn't opperate the same. For references, I have experiended becoming pregnant while my menstrual cylce was on. A relative of mine hasn't had her period within maybe like two years. And she's pregnant now. If you have never had a period in your life, you can still get pregnant if your first cycle is starting. For example if someone were going to get their period June 1st, they could have had unprotected sex in the middle of May and still gotten pregnant. But you can't get pregnant more than a month or so before your first period.
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