Blood in urine?

[RolyRocks]

(Photo attached)
I have just found this where Loki, my dwarf normally pees. I'm pretty sure it's blood although it is not a dark red colour, more of a pink colour. This is the first time I have seen it like this and yesterday when I had him out he did a little pee on the floor and it was completely normal.
I have checked him all over and he appears fine. Should i just keep a close eye on things or take him to the vets tomorrow?
I remember Roly did a strange coloured pee once but think it may have been because of a coloured treat he ate and it was just a one off. This looks definitely more pinky though which is worrying.
Any advice is very much appreciated. Thanks