Me too...My cycle was 30-33days before IVF.On my failed IVF cycle and 2nd cycle,M came on time(Day 32),But on 3rd cycle after IVF,ovalution on Day 27!
I think it maybe the effect of IVF.
(Remarks:I saw Pxxg ec almost three weeks in this cycle,but my temp was flucuated after taking medicine.So I stopped all chinese medication.)