FRUSTRATED! With my OB

So today marks 7 weeks for me, and my first OB appointment that my husband and I have been very eagerly awaiting. They called me just now to tell me that they're changing my appointment because I haven't had another physician office confirm my pregnancy. I took three at home tests. They say "you're just not far enough along for an ultrasound". All they're doing for me today is a pregnancy test. No ultrasound nothing! I'm so irate!