Is it possible that my ovulation date follows a 28 day cycle but my cycle is actually 31 days. Last month my cycle was 31 days (af 3 days late according to Glow). This month glow had me at a 31 day cycle but I got a positive opk which was about 4 days earlier than glow anticipated. When I put that in it brought me back to a 28 day cycle and af should be here today. But still no af and multiple negative pts

I don’t know if that makes sense but I’m ovulating as if I have a 28 day cycle but my periods seem to be late each month (about 31 day cycle)

Does this happen to anyone else... af is always late but ovulation is on time? Should I be concerned?