Anyone else having bradycardia?

I’m 9 weeks pp and I’ve been dealing with a slow heart rate lately. It’s just so uncharacteristic for me! My heart rate always sat in the 80s on a good day and high 90s on a bad day, and I have POTS so standing up my HR usually jumps to around 140 but has been as high as 190. Anyway, lately the highest it gets while standing is 110, and my resting heart rate has gotten as low as 48 that I’ve caught. It really terrifies me and I’m scared there’s something wrong with my heart. I’m going to call my doctor on Tuesday but I’m just so terrified and anxious about it all the time, it’s scary and I’m scared something is wrong with me.