My personal experience has been that heavy exercise (incl. cycling) can contribute to anemia, which can delay ovulation. Before I was diagnosed and started supplementing with iron, heavy cycling would extend my normal 33 day period out to a 38-45 day long cycle. I'm trying very hard to not get pregnant, but lemme tell you having a period arrive 3-4 weeks late is very nerve-wracking!

So, as long as you're not anemic or nutrient deficient due to heavy exercise you're probably ok.