Hey there!
Thats so wierd because i had the exaxt same thing happen to me a couple days ago. I was diagnosed with UC a few weeks ago but I think ive had it since March, but i had to wait 6 months to see a GI. So far the only medication I am on is Salofalk 2x a day. But the same thing happend to me, I was feeling good, not that many urgencies, and when I did go to the bathroom it seemed normal. And then a couple days ago I had blood again, and there was some mucous in there too. And like you im hoping that its just hemmroids because I dont need any other problems lol. Although im thinking it may be something that i ate, because i did decide to eat some smoked sausage (i couldnt resist) so maybe that caused some digestive issues.Im seeing my doctor again on Monday so ill see what she says.
good luck with everything!