Should I bring up to my dr?

So a few weeks back I went to the ER for my heart racing it was at 130bpm. If I lay down a certain way i get bad palpitations n feels like my heart is slowing down. Bit they did an EKG n cake back normal. Did a chest x ray n my heart is perfect size n nothing blocking my arteries. I just don't get what's going on. I doubt have chest pain when it slows down n I have no heart problems. Is this normal w pregnancy? My heart rate will go down to 55 according to my phone. It just scares me that ill have bradycardia n go into cardiac arrest lol. (Im a hypochondriac)

I take unisom for nausea would that cause this?

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