Hello everyone. I'm 13 weeks pregnant. My heart starts beating very fa…

Hello everyone. I'm 13 weeks pregnant. My heart starts beating very fast and then slows down. Is this common for pregnant women? Or is it just me? ? I'm just curious... I'm going to have an ultrasound of my heart soon, they sent me to the polyclinic, they said there's tachycardia. I haven't had anything like this before, not even during my first pregnancy. My weight is small, I know that can be a reason.