first you have to determine when your ovulation happened seeing as your fertile window centers around that day. Like I said before- if you have unprotected sex in your fertile window then the chances of you getting pregnant is the same as those couple who are trying for a child (provided you or your partner don't have reprductive issues): 25% chance a cycle... there is no sure fire answer to say you are or aren't pregnant until you have missed the day of your expected bleeds to begin.
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