U can start doing opks as soon as u finish af if u dont know when u normally ovulate that way u can get familiar with your cycle. Later on you'll know your own pattern and can quit testing so much. Test once a day. When your lines start getting darker , test twice a day. Between 2 and 10 pm. Its positive when the test line is as dark as the control line or darker ! Good luck.

Sorry couldn't comment yesterday, had molar extracted and now have infection with dry socket.

How long are your cycles? I usually start using OPKs around 7 days after AF ended. I ovulate typically between CD 15-17

Pretty sure I was have withdrawl bleeding. I had my IUD removed 1/15/2018, started bleeding heavily on the 17th bled strong the 17th, 18, and 19th. Quit for the day on the 20th, and woke up the 21st bleeding again. So Finally today, after being almost 2 weeks late Af came. Now my question is. When should I start taking opks. I only have about 20 test and I'm hoping this is my last cycle before my bfp. Any advice or words of wisdom to help conceive is greatly appreciated. Thanks you for all your help ladies. Baby dust to us all!!!