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Breaking Barriers: Track Your

While cycles vary between people who menstruate -- which is part of why the "calendar method" isn't a good one -- a vast majority of those people will be most fertile mid-cycle, between around day ten and day fifteen of each cycle, especially when you factor in that sperm can live in the vagina for several days. The chance that is also the highest-risk window for her is very good. For both of you, understand that if you're going to use natural family planning as a sole birth control method, that involves your girlfriend charting her fertility cycle daily, both by checking her cervical mucus and her basal temperature. With a person with regular menstrual cycles, after doing this for a few months, they can begin to pretty accurately predict when they are most and least fertile, and then abstain from sex during that window, or only have sex with another method of birth control at those times -- but without doing any of that charting, it's nothing more than a guess and a gamble, because people who menstruate do not all have the same cycles. So, one person's safer -- really, no time is "safe" to have unprotected sex if you don't want a pregnancy -- windows may be day one to day nine, and then again from day 20 to 28, while another person's safer times may be from day one to day four and then again from day 13 to day

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