So racer gals - what do you do if you have a race and it has an unhappy conjunction with your period?

I ask because I went for a long (90 mile) ride with 2 of my workplace teammates yesterday, and it happened to be the 1st day of my period. I'm blessed with very little cramping and only some bloating, but I get grumpy with the best of them and often my body's temperature regulation goes haywire - I freeze at the slightest breeze and start sweating the next minute.

But yesterday I just felt so TIRED! Not the stimulating, lungs pumping, heart pounding, actually working hard-tired, just weak, heavy legs with no desire to work. Most of the time we kept to a very gentle pace (we used most of the day) but once we started picking up a bit of speed I swear the only thing that kept me from begging them to slow down was mumble-shouting "HTFU!!!" to myself.... (learned that one here )

So it was the longest ride I've done so far, but my previous longest ride was 75 miles, at a faster clip (but with a large group) and I felt terrific. The one race my colleagues and I are doing as a team is about 90 miles but in 2 weeks time, so I'm hoping desperately I just had a bad day yesterday and will feel much stronger once my period's over.

But I think maybe if I should be checking if the races I want to do happen to fall on the wrong day of the month I never want to feel this weak again riding a bike, to be honest!