Not feeling movement at 18 weeks!!

Not feeling movement at 18 weeks and it driving me crazy! I'm so worried! It seems like everyone else already feels their baby! My next scan isn't till 20 weeks (2 whole weeks from now) you think my OB would be mad if I made a appointment to come in next week just to hear the heartbeat. Give me a little peace at mind. I'm a nervous wreck. Advice please! I just wanna feel my baby and know everything is okay....😔