Is a Doppler worth the money?

SC
I see my doctor Wednesday for my 12 week scan. I'll be 12+3 when I see her. I saw her last at 10+1 and I feel like it was FOREVER ago and I'm dying to see my baby again. I have a feeling I won't be seeing her for longer between this time and the next time. Maybe 3-4 weeks instead of 2 weeks so I was wondering if a Doppler was worth getting to check on baby in between visits? If you vote yes, please tell me the name of the one you recommend. 

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