BETA BLOCKERS, PROPRANOLOL, POTS

I was diagnosed with POTS about 4 years ago. It's a condition that basically means I have a fast heart rate. I take propranolol to slow my heart rate down to normal. I tried to get off my meds while ttc but my heart rate jumped to 140 bpm at rest one day and my doctor said to go back on my meds. My doctors told me it's safe to be on my dosage of propranolol while ttc and being pregnant. Just looking to see if anyone else has this condition or maybe takes this medicine.