Heart beat disappeared?

ShayMWT • Currently: 27 weeks ! due April 8th 2016 #BabyGirl 💝 My love 😍
Hello ladies 
Just wondering has this happened to anyone . Yesterday I seen the heart beat and baby moving & I heard it on Monday also. Today the Dr was unable to find it . She said she's not worried . Has this happened to anyone then heard it again . I'm 10 weeks 6 days . Thanks