Period at MEPs

I’m scheduled to meet with my recruiter Monday so I can set up going to MEPs on Wednesday and Thursday, but I forgot my period is supposed to start on Sunday (my body is really tricky so it might come on Tuesday). I know I’ll be uncomfortable and there will be blood in my urine. Ugh! Should I reschedule or just go through with it?

If I do reschedule how would I tell him that’s why I’m rescheduling?