Yes, this has happened to me a few times/year last year...I am 47 going to be 48 in May.
The mucus and the other ovary doing a twinge thing ....and I had a check-up in October with everything being fine.
I almost felt like the poor little ovaries are mustering up all their energy to get enough hormones going...and maybe they both had a shot at it that month
I guess that's why they say the rhythm method is not reliable in our 40's...or worse...twins!