Share 'Question about fertile mucus and ovulation'

Hi. So I'm using calender+mucus+BBT to not get pregnant. Here's the thing though. For the last two months I've ended up with fertile mucus (aka Spinn) around day 10, and yet no true ovulation until like day 20 with the temp. It's pretty clear with the temperature too. But then, I've ended up with my period about 8 days after ovulating. It's all very screwy. I mean, it's possible that things are s…