I know this is going to be an odd question. The other day when I was petting Cricket, she rolled onto her back. Its not the first time she's done that, but the first time I really looked at her belly. I noticed she had some little dirt spots, so I cleaned them off and then noticed she had dried blood around her vagina. Now I don't know how long its been there because I haven't seen any spotting areas in the house as if she were in heat. I'm thinking that its been there since we got her. Well I took as soft a rag as I could, the kind they use for babies, and got it damp, and wiped the area off. It took a bit too. It looks a little red. Its not inflamed or anything. Do you think maybe that was just from me wiping or could it be infected? What signs should I look for in an infection?