Questions about a gravid boa?

[Swan]

Hey guys as some of you know I put my male with my female (surinames) together and she had the big bulge that lasted for like a day and a half. Now she seems to be going into a shed. All she is doing is laying on her side all day and hardly moves! Is this a normal thing? I took her to the vet and she told me she Is plenty big enough and has enough weight to her, but I'm really nervous. She's my baby. Any advice or explanation of the process would be greatly appreciated! I've been ready a lot of literature, but nothing beats your guys experience. Having had litters.