There is another similar thread to this in 1st Trimester section. Basically yes this is normal. Because your babies heart has only just started beating it takes a little while to build up and start beating at the rate it will beat at for the rest of your pregnancy.
Try not to stress if you check out the other post i mentioned there are quite a few posts in there with wome nwho had the same experience I'm sure it will make you feel calm!
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