Doctor office whoas

Im disappointed with my ob office. So first they push my apt back by an extra week because my doctor went on vacation, and now they want to push it back another 4 weeks. So i went to a 16 week appt which they want to push back to 25 weeks. Hell no, telling me the ultrasound tech is going to not be there for my apt that had already been scheduled for 5 weeks in advanced. Im pissed