My cousin decided to bring a random homeless girl who’s super sketchy over to my house and when I went in the bathroom afterwards I noticed she used all my makeup (I threw it out) and then I brushed my teeth, only afterwards did I consider that she may have also used that. Could I have some sort of std or illness from using the toothbrush after her? I used it a few hours after she might have used it and also rinsed it off with water before brushing. I’m not sure if she has herpes or aids or something but I’m just wondering what possible std or illness I could have? I haven’t even touched my boyfriend in fear of having caught something, maybe I’m paranoid but I know nothing about stds and need some reassurance.