Hi Tammy! During pregnancy I only teach my classes and modify them as needed.
When I am not pregnant, but also not getting ready to film, I do my classes but also do my own lifting on the side (one body part per day).
When I am getting ready to film (and obviously not pregnant), I do my classes, my own lifting, and rehearsals.
Through all of these phases I eat a healthy diet and simply fine tune it more when there are "special occasions" coming up.