I just had this happen for the first time in the 12 years I've had CD a few weeks back. I called my GI and he prescribed a medrol dose pack and just said to let him know if it didn't help. Haven't had any bloody D since then, but have noticed some on the toilet paper once or twice. He didn't seem to be too worried about
it just happening once, but I think you should call and let your dr. know.