I’ve had some palpitations during pregnancy that feel a bit like that, happened when I was ill and my body under a bit of stress. Dr sent me for an ECG and wasn’t worried by results, would suggest popping in to GP to get checked x
Silent reflux can also cause this. Could be worth speaking to your GP about it, just to see if they can suggest anything x
Could be palpitations, low iron can be a cause 🫠
Sounds like anxiety?