Yes: in a 28 day cycle, ovulation would have occurred on 8/27 but the fertile window includes a few days before and after that and your cycle could have been a little longer meaning you ovulates a few days later. Even if your pregnancy dating is based on an ultrasound they are plus or minus a few days ( more the further along you are at the time of the ultrasound). Hope this helps.
Answered 3/24/2015
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