The best time to schedule your pregnancy session is around 28-34 weeks when the tummy is nice and round. This will vary some women who carry small or gain little weight may choose to wait until they are 36-38 weeks. Other women who are growing a bit more rapidly, may choose to schedule 28-32 weeks.You want to schedule the session when you feel good. It is best to schedule at least 1-2 weeks in advance.
Typically maternity sessions last about an hour. You can schedule your session in-studio or on location. During the session, you are more than welcome to incorporate family members. You will want to coordinate clothing. You may also want to consider getting a manicure since your hand will play a big part in the session.
I charge $400 for the session, which includes all the digital files, copyright release, and some minor retouching.
Here is a link where you can find information about Newborn Photography Sessions.