Prawn, definitely inquire, and also, start querying again! The exclusive is over and it's time for you to get back in the game and (hopefully) get some leverage, because even if the first agent comes back with an offer you want to be able to tell them you have some other interest.
(PS everyone says the publishing world slows down in July and August so it's not as if you'd be bugging them the week before BEA, you know?)