Ok, guys, this is some weird wicked stuff and I'm going to sound like a complete loony, but here's the facts. I got off the pill a year ago, in February. First 4 months my cycles were more or less regular 28-31 days. Then we decided to start trying and I went out and bought Pregnacare (the one the doubles as pregnancy+conception). First month taking it, my ovulation was 10 days late. I got slightly worried, but wrote it off as one time thing. Next 6 months, my cycles got completely wacko!
This last one I started charting and was taking notes of everything. I was taking Pregnacare from CD1 to CD19, first thing in the morning, with breakfast. I was having fertile CM from CD12 and pretty much notstop, but no ovulation. The long time suspicion of Pregnacare's "HELP" to conceive finally overpowered me and I decided to stop taking it on CD20. Same day later I got +ve OPK. I didn't have Folic Acid as it is, so I decided to go back to Pregnacare. So started taking again on CD21, having missed just one day, CD20, the day I got +ve OPK. Despite the +ve OPK, I didn't ovulate in the next days. I stopped Pregnacare again on CD24. Started spotting 2 days later.
I finally ovulated on CD32.
Moral of the story: it might as well just be a total coincidence, but I'm not touching this Pregnacare ever again!