I am 21 weeks pregnant have suffered from IST years ago but it hasn’t really bothered me in recent years. Around 17/18 weeks of pregnancy my heart rate started shooting up with the slightest exertion even just walking down the corridor in work would set it off causing me to feel dizzy and breathless. I was admitted to hospital for a few days had ecgs, echo, thyroid bloods, lung scan for clots etc all ok just high heart rate. Cardiology feel it’s pregnancy aggravating the pre existing IST. I’m at a stage now where it’s impossible to do any activity without feeling awful trying to struggle through work but I’m on my feet all day so it’s a struggle. My heart rate is 90-110 resting and anything up to 145 after any kind of movement: Anyone experience similar did it get worse or improve any bit? Really don’t want to go out sick this early. Thanks and sorry for the essay!