IMMEDIATELY! Call! Right Now!
OK.. wait til morning.. they might not appreciate a call so late in the day..
Unless you live on the West Coast, in which case it is still early enough to call. (Oh, looky.. you ARE on the West Coast! Call NOW!)
OK.. voice of reason.. do you have a place you can brood your wee baby chickies? Have you discussed this with your spouse/significant other? Are chickens allowed where you live? Are they sexed? If not, are you allowed to have roos? If not, what will you do with any that turn out to be hims? Are you aware of and prepared to take on the costs of setting up a secure coop and run, bedding, and feed? Are you aware that having chickens causes your brain to go to mush over the cuteness of them and you will soon need to get even MORE chickies...?