If this was a purchase you should of received a payment coupon in with your closing documents if you have not received one by the time the payment is due. Your mortgage should be recorded with the County Clerks office very soon...sometimes this takes a little bit before they receive the information depending on the title company.
If you did not receive a payment coupon in your closing package and you have not been sent on 15 days before your payment is due...get a hold of you loan officer and see if they can help you with this.