My body was gearing up to ovulate around the predicted time (I've been having long cycles), but OPK didn't get as dark as normal (usually over 2), and I had one outlier low temp after expected ovulation that threw my chart off. I did take Zyrtec the night before the low temp and wonder if it could be related. Do you think I ovulated (chart would indicate so without the one low temp)?

Background- I had a MC with a D&C in April, this is my 3rd cycle since. Last month my body got ready to ovulate per opks, but then didn't actually ovulate until a week later giving me a 42 day cycle.