heart beat?

XoXBabydollXoX

I went in for my first prenatal appoinment today, and i told my doctor my concerns about how my pregnancy symptoms have gone down and away in some and she said that was normal the closer you get to the second trimester, but when she tried to hear the heartbeat she didn't hear anything (except my stomach rumbling) she scheduled me to come back in two weeks to see if we can hear it then(and to follow up for the upper respitory infection that i have)....i'm 9 weeks pregnant and not exactly tiny, is it normal that we didn't hear the heartbeat?