I have to get a pelvic and renal ultrasound. This currently is scheduled for the last day of my period. There usually isn't a lot of bleeding, but enough to keep a tampon in, or use a pad.

Is this going to cause problems? Should I reschedule the ultrasounds?

Call the place you have an ultrasound with and find out. Different ultrasounds and different procedures for different clinics.

OK. I called and they said it isn't a problem, they do them all the time while females are menstrating.