Hi ebrilia, welcome to PC!!!
I'd say that unless she is generally quite uncomfortable talking about anything of a sexual nature then you're fine
If she is generally uncomfortable, then just send her a text saying you hope she wasn't offended by the message about the condom, that you were just joking and sorry if it did offend her.
But if she isn't that kind of a person then.......you're fine!!! She could take it as a joke; as a semi joke/semi caring comment; as a friendly concern; as a casual reminder from a friend.............but in this case however she interpreted it her reply seems positive/friendly/good natured. Nothing to feel ashamed or embarrassed about.
Alison