I think there's no set time table for saying "I love you." If you feel it, say it. You need not look at a calendar page. I think with my husband and me it was some 4 or 6 weeks, something like that. We were older but the point I am making is that there are variations there.
As for the second base thing, I think you got the go-ahead but there's nothing wrong with going in for it and asking, at the same time, "Is this okay?" I doubt that her actions were accidental but since you're unsure you might as well make the inquiry. The worst that can happen is what, exactly? Is she says no, it's not okay
, then you're covered, and you're not just some insensitive jerk who grabbed her and didn't care about her opinion in the matter. If she says it's fine
, then go ahead. If she is inconsiderate about your asking, then maybe question why you're going out with her in the first place.