Help please ?

Me and my girlfriend have been together for several months but we haven’t talked about doing anything really sexual..? (I mean I clearly want to but she’s not aware of that as far as I know) lately shes been taking things I say in a more sexual way and says she would do it under her breath but I can’t tell if she’s serious or not. I want to bring it up with her and let her know how I feel but I’m not sure how Bc what if she finds it gross or weird that I want to. I’m just not sure if she’s into me that way.