You fucked up with that message, haha. In a case like that the better choice would have been to hangup and call again. If she didn't pick up then you'd want to leave a message but not something like what you said ideally, but it's not a big deal. If you got nervous at the machine you should have just hung up right there and calmed down. Women can spot that kind of intimidation/nervousness a mile away and that might totally switch her perception of the guy she gave her number to.
Honestly though, it's not a big deal that kind of message is normal. And again, she was interested in you and gave you her number. Also, a little tip for the future you might have called a bit too soon, it can really be good if you wait as long as you can before calling a chick back unless you've got a reason for calling her. Remember, she wants you, you don't want her, at least that's what you want her to think. No woman wants a man she can have, it's a game for them especially the cute ones
