someone explain how does one become more fertile then other?

Hi ladies can someone explain how can a women be more fertile then other? In other words if both women are ovulating one fell pregnant within three months and the other a year so what makes it that lady not able to concieve when having sex all in good time? I, myself hve been trying for 7 months, i know other ladies who have concieved straight away i just dont get it. I do use opk and have sex during my fertile days. Cycles in the past 6 months ranged from 25 to 38.

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