What's going on with my cycles? Anyone going through anything similar?

We're on month 9 on ttc. We have stopped tracking and just going with The flow. Well 2 months ago my period didn't come until CD 46.. And last month it came on CD 37. I normally have 31 days cycle give or take a day or 2. It's really starting to worry me. What could be going on? Am I not ovulating?