Csection makes ultrasound harder to see?

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I’m just wondering if this sounds normal… I went to my anatomy/full body scan, I’m 21 weeks. She said the baby looks great but we had to reschedule a half hr appt for her to do another scan because she said she couldn’t get a good view of her heart. She mentioned sometimes csection scars make it a bit harder to see something so intricate so I’m going back when I’m 24 weeks so she can look at her heart again. Does this sound normal? She is the OB who is a diagnostic sonographer so she knows what she’s doing… I’m just scared 😟 any input?

Xposted in General pregnancy