I haven’t been able to make BBT work but TTC 5m now and I’ve been all over the place on when I get a positive OPK (CD15 up to CD31) . Also got one month where I may not have Od at all...so I’m taking another stab at this. However I only started CD10. Assuming I won’t get any official answers because I don’t have enough data? I’ll add a photo just for reference. I’ve been looking at everyone’s posts to learn more on reading the charts. Appreciate everyone’s input , it feels so daunting to me starting out .