Heart rate concerns


So I had my ultrasound yesterday at 17 weeks and we were so excited to see our little babe. Sadly the baby was moving around way too much to determine the sex. But the tech paid extra attention to the heart- the heart rate was at 188 and she obviously couldnt tell me any concerns but she said that's okay because the baby is moving around sooo Much. But after going home I recieved a call from my doctor saying how I'm going to need to go back to have another scan done in a few weeks because they had some concerns about the heart- she said they couldnt see it as well as they wanted too

So my question to all you lovely ladies is did anyone else have a similar issue & should I be concerned...because all honesty I'm freaking the f@#! Out 😭😭