Hon I don't know when you post this. My cat is going into labor soon and she has a brownest stuff around her area. It could be her water broke and nothing more, when women water breaks theres blood *bloody show*
Spotting blood in a pregnant queen is not normal. You need to get her to a vet that can evaluate her condition. A clear, mucous is what you should see if your queen doesn't lick it clean before you get a chance to see it.