Im 7 months months pregnant. I called to reschedul...

Im 7 months months pregnant. I called to reschedule my routine prenatal 4 times. Each time a assistant told me they'll call within a few hours to tell me my new appt time & date, but never did. I finally decided to go to the 2nd & reschedule. It was a complete waste of time. Why is it specific days that you have reschedule? I was very pissed. Needs improvement on making sure patients get their appointments rescheduled.