What are the odds?

I got a positive OPK on August 23 and 24. I know my husband and I should have had sex on August 23, 24, and 25, but we only managed to get one session in on the evening of August 23. My friends said they had to have sex several times in their 3 day fertile window, so I am wondering how likely it is that I will even get pregnant this cycle.

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