Depends on the reaction, read body language/facial expression lah. If she looks disgusted then you definitely fucked up. If she looked surprised and just shocked, it could be that she was just startled and not used to it/ready for it yet.

Talk lah to understand more, see if she's open to try more or really want to call it off. Sometimes all you need is proper communication, especially if you're inexperienced/not good in reading social cues.