Fetal echo

At 20 weeks I went in for my anatomy scan. They said they couldn’t get certain views necessary of the heart. Went back two weeks later and still couldn’t get those views. This is copied from my MFM drs note

The following structures appear normal: Heart / Thorax 4-chamber view. LVOT view.

The following structures could not be adequately visualized: Heart / Thorax RVOT view. Aortic arch view.

I have an appointment next Wednesday @ 28 weeks for a fetal echo at Boston Children’s. Very anxious about this and wondering if these means there could be an abnormality or if it could still be all normal.