hi there and welcome to BnB!
It's totally possible to ov on cd10. It's a little early going by general averages, but still common.
Are you sure your cycles are always 41 days?
It is very unlikely that your ov would be on cd10 if your cycle is going to be 41 days this time, impossible I would say... The time between ov and af (luteal phase) is usually around 14 days, for all women, Less than 10 is a problem, up to 16 or 17 is good (as far as I know) but 31? no, I don't think it's possible.
Either your pains weren't ov pains, or you are going to have a shorter cycle this month, or you are going to ov more than once this month.
Best way to find out about when you ov is charting your temps.
Good luck chick!
