@juliar19 - I'm sorry you aren't getting a firm answer to your issue, and I can sympathize, having gone through something similar in my 40's.
After a lot of tests (and a lot of "why are you here?" from cardiac staff) the cardiologist was left to conclude I had vasospasms, resulting from stresses with job, teenager & family illness. (I also have a right bundle branch block which is hereditary, possibly congential and has changed little in 10 years of monitoring.) Due to my family history we were also concerned. When I told one sibling what had happened, she reported that she & two of my brothers had been treated for the same... So for 25 years, we have been watching, and my heart is now, in my 70's, showing some changes but still strong. Even though my Dad & most of his family had serious heart disease, and my Mom and maternal Grandfather died from serious heart issues, I guess our vigilance about about diet, weight & exercise is paying off - only a few of my 60+ cousins & siblings in this generation (aged 62-94) have serious heart disease.

Think of the stress you have been under for this year with pregnancy, childbirth & all the life changes. In your situation, I would be inclined to conclude that my heart is okay and that I need to focus on reducing anxiety. Perhaps start with your primary or OB to find that assistance.
Sue