At-home fetal Doppler question

Megan
Hey ladies,
So I bought my sonoline B fetal Doppler and after a few days, at 9 weeks exactly, I found the heartbeat. I found it again for the next three days (right around the same spot).  However, since then I haven't been able to find it again. Has anyone else had this problem?  Also, is it possible for the baby to move around some (should I be looking in a different spot?). 
Thanks!

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