Last month was my first using opks - I started on cd10 and got my first positive on cd21, it went negative again on cd23 and then positive again on cd26, the i got on cd29 without having ovulated (no temp rise) so my question is when should i start using them to catch ovulation??? i don't want to miss it, but i also don't want to waste 20 odd tests before i even get a positive any suggestions??
