So me & my boyfriend were fooling around last night and he tried to put his penis inside me but I told him no because I was on my period and plus I didn't have a condom. So i made him stop. I had a tampon in but I think the tip his penis could of possibly went into my vagina a little bit. It wasn't all the way in because I didn't feel it go inside or anything. Am I at risk for a std or hiv?