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First time using OPK

Mackenzie • Thu, Aug 22

This is the first time I’ve used opk’s. I took two yesterday (as you can see in the picture) on cycle day 14 and they were SO faint. I also took two today and they were a lot darker. App says I ovulate in 2 days (cycle day 17). I’m going to take one tomorrow and Saturday as well. When would you have sex? Both days? Every other day. Any other advice welcome for using opk’s. Thanks ladies!