Question: How many spin-off series were spawned by the TV show that featured Farrah Abraham in its first season while she was pregnant?
Sentence (from "Teen Mom"): The series follows the lives of Farrah Abraham, Maci Bookout, Catelynn Lowell, and Amber Portwood, who were featured on the first season of "16 and Pregnant"; it documents their first years of motherhood and places additional emphasis on strained family and romantic relationships.
Relevant evidence: Yes