Gravid? Please help!

[Wit36]

Hello
I am new to keeping reptiles. I bought my first leopard gecko a few days ago and I think she may be gravid. When I went to the pet shop the gecko I bought was in a cage with multiple other geckos. The person helping us choose a gecko told us that they were all males. Anyway I asked if she could double check the gender of the gecko I selected. She double checked and said it was actually a female. When I brought her home she ate 2 crickets. Since then it has been 3 days and she has not eaten ANYTHING. She has also been spending a lot of time in her humid hide. Also she is rather fat compared to my brothers gecko. Considering that she has not been eating and she is fat and spending a lot of time in her humid hide also she was with all of those males at the pet store it makes me think she is gravid. I took a few photos of her belly and it would be greatly appreciated if you could tell me if the white mass I see is an egg.
Thank you