I don't have hemmoroids, but bleed from the ulcers in my rectal region. It's bright red like you describe. As others suggest, it doesn't take that much blood to turn the water red, so just keep a watch on it. I pretty much bleed daily, sometimes more than others.
You did the right thing to call your doctor and let him know. Hopefully you'll get the rectal meds to stay in there - they help tons. I use a plastic baggie to push them in then hold them in for a bit. After a few seconds I can feel the suppository go "up" and I know it's no longer going to slip out.
--female dx as UC in '04 (1st symptoms in '03), switched to Crohn's in '05, 1 fistula, crohn's colitis, limited to large intestine --rejected (reaction/didn't work): Asacol, AZA, 6-MP, MTX, Remicade, Humira, prednisone, Tysabri
--Prochymal in Phase III study (can't wait til it's approved!)
--Compounded budesonide 3mg/daily, Started Cimzia first dose 2/10/09. Dx Osteoporosis 10/08 started Forteo 1/27/09