36 week check up

Today's check up went much differently than normal. Had a slight issue yesterday at work where I somewhat fell, caught myself but it jarred enough that I was cramping most of today. So doctor did some extra tests and is hearing a heart arrhythmia with our little girl. We go back in 2 days for ultrasound and additional tests. They said it can go away on its own and most of the time it does, so the logical side of me is trying to hang on to that. But the hormones of being 36 weeks pregnant and spending over 5 hours at doctors office between today and Thursday has me on the anxious side :/