question about bi-weekly appointments

I know all offices are different but my last appointment has me confused. as of today, I am 28 weeks and last week at 27 weeks I did my glucose test. when it came time to leaving the appointment, we scheduled my next appointment. I was told that 27 weeks will be my last monthly appointment and from so on I’ll be going biweekly. they then proceeded to schedule me for weeks out so I asked her about it and she reiterated what she already said and I left confused. I clearly stated I am 27 weeks (at the time when scheduling) so why is my next appointment not for four weeks? her answer was merely not super helpful because she just reiterated that 27 weeks would be my last monthly appointment.

should I be calling and asking if my appointment was scheduled wrong? my mom is also curious about it too as a nurse that has had 4 children lol. i live in peoria arizona if anyone knows anything about this area!!! :)