6k And period?

Ella • Goth hippy witch

I’m running a 6k that is very important to me this weekend. The only issue is I started my period today and I will be at my heaviest flow when I run. I wouldn’t be worried but that last race I did on my period, I almost passed out from overheating and pain from cramps. Does anyone have an advice? I’m vegan and also iron deficient so that doesn’t help 😫