Doppler or ultrasound?

I have a doctor appointment tomorrow because he wants to check the heart rate on the baby. I'm on progesterone inserts until Tuesday but he said he wants to make sure everything sounds good with baby before I get off of them. I will be 9w3day tomorrow. I'm not thin but I'm not fat. I just think because I don't have a flat tummy they won't be able to hear it because baby is so small. I've tried to find the heart rate on my doppler I have but I have had no luck. Do you think he'd probably do an ultrasound or try the doppler? This will be the first time the heartbeat is heard to.

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