doctor apts

So, throughout this pregnancy ive been having to move back and forth between two cities pretty much the whole time (18 weeks i think), because of my boyfriends work schedule and a few other obstacles.. its been pretty impossible to make an appointment to have the baby checked on and ive missed every appointment weve made so far.. its making me really nervous that we havent seen even one ultrasound yet for the baby. does anyone know of any sort of place that a doctor would take me on a short notice basis to check up on the baby? i was thinking even just going to the e.r. and asking? 🙈☹