I've never spent time with anyone who didn't provide them. That being said, you might wish to be a good Boy Scout and "Always be Prepared".

The provider will almost certainly provide one.  But ultimately, YOU are responsible for protecting yourself, so you have to be prepared for the unlikely possibility that she has forgotten or has run out.

So: bring one, even though you probably won't use it.

Sometimes I've had trouble "fitting" a large guy and had to try 2-3 different large sizes before one felt comfortable. This interrrupted the flow, of course.

So, if you are one of those guys, bring your own and give it to her as soon as you head in the bedroom.