Laying down for bed to sleep and felt my heart beat normally then 3 times really fast in a row, back to normal, 3 times really fast, and now normal since.

It feels like my chest tightness and a tickle in the throat like I need to cough.

I have a heart holster done 7months ago (3 day monitor) as well as an EKG and stress test and echo. Said everything was fine a bit of sinus tachy and nothing else.

Does anyone else get these random fast beats? Is it dangerous? I'm 7w4d pregnant