Just wondering if its possible to ovulate 3 days after a positive opk? I have been ttc for 7 months now and have diff length of cycles each month beween 30 and 33 days, this month I had a positive opk on cd18 and was still getting a positive the following day. AF looks like it will arrive tomorrow making it a 33 day cycle this month and when I put that data in to my app it gives me a predicted ovulation date 3 days after I got my positive? Would love to hear your opinion on this as I always thought you ovulated at most 36 hours after?