Left side pain 11 weeks 2 days

Went to the ER at 9:00 last night for severe left side pain. Sat there till 1:00 when they called me back and did an ultrasound externally. I was 11 weeks 2 days she said I was measuring 11 weeks 5 days and you could see every finger and toe and its nose. Couldn't get the heart rate because it wouldn't quit moving. Little booger. The physician told me it was severe round ligament pain