I have been tracking my periods on glow for the past 6 months. DH and I decided last month we are ready to TTC. Last month we BDd based on glows estimation of when I ovulate. This month I got OPKS and have been testing since CD13 (all neg). After looking back at my previous calendars, it looks like I’ve ovulated every month 13 days before AF is supposed to come, which means today (CD 17) should be the day! Took an OPK this am and vfl. Hopefully my surge will come this afternoon/evening when I test again so we can BD on time!