Has anyone else seen this or know what it is?

Chelsea • Mommy to a beautiful baby boy born 01/01/2019 & expecting baby no2 in April 2020! ❤️❤️

Had a 4d scan today at 29 weeks and couldn’t really see very much as she was snuggled up but the photos we did get on everyone of them there’s this darkness over her eyes?

I’m just wondering if anyone else has had this or knows what it is.. I’m hoping it’s just a shadow but I’m not sure. Any help would be great 💕💕