I've same issue during my pregnancy
Gynae advice me to have a full check up at cardio specialist, which I didn't n no medication.
i monitor my heart rate 5 times a day at home, keep myself calm n slow down my daily activity speed.
I've csec at week 37, heart rate back to normal after delivery. Baby is healthy 😊
It's your body, no one know better than yourself. Do what u think is good for yourself n baby 😊
An Lela Liyah