Hey ladies! Advice?

Stac

Hey, so my boyfriend and I are trying to convince. I'm 30 he's 38. We have tried the past few months with just guessing ovulation based off of apps. I figured we better step our game up a bit. He has a 10 year old son, I have a 7 and 3 year old. I just started AF today, I'm going to order opks. When should I start using them? Anything else we could do? Thanks for the help!