Anyone wake up with heart racing?

So

About 3 different nights now I’ve woken up with my heart pounding. As far as I know I wasn’t having a nightmare or anything before I woke up. The last time it happened I checked my Fitbit and it said my heart rate was 112. It doesn’t go down right away either. It’ll take at least 20 minutes for me to feel like it’s not pounding. My sister thinks it’s because I had rolled to my back, but the last time I woke up like that I was on my side, plus I still barely have a bump (25 weeks) and I don’t have shortness of breath with it. I don’t really notice my heart randomly accelerating during the day, but I’m also keeping busy with work and unpacking from moving so maybe I’m just not noticing if it does happen. Anybody else experience this in the middle of the night?