Can anyone help with understanding an ultrasound/possible medical issue?

I paired one of my boas in winter. She showed some signs of pregnancy and had a possible due date in early July. She never had babies, but did seem to have what looked like contractions around that time and a few times after. I took her to the vet for a wellness check, and the ultrasound showed ~three “fluid filled follicles with possible matter inside.” The vet was unsure about what exactly this meant.

The snake appears healthy in every other way according to the exam. If anyone could help me understand if this is a medical concern that would be appreciated.