Is it possible to have a positive OPK result the same day you start your period

Kayla
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My husband and I have been TTC for 7 months now. I have been taking opk's over the past couple of days (clearblue advanced) and the past 5 days they have came back "high". AF wasnt supposed to come for another 11 days, but I just started today. It just doesn't make any sense to me

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