I know occasionally I think there is blood just due to color but it can certainly be something else. Occasionally I wipe and it's bright red and that is usually just irritation from wiping. I don't overly worry about it as it's not very often. If you are constantly seeing it I would possibly get it checked out, I also realize that you aren't too far from your surgery date and you are still adjusting.
Good luck, hopefully this was helpful.