It is often stated that Abigail was the daughter of Humphrey Pinney and Mary Hull. The latter did have a daughter named Abigail but she was born on Nov 26, 1654 and married John Adams. So, she wasn’t John’s wife.

1639, June 16: John Moore married Abigail, surname unknown.
Ref: "New England Marriages Prior to 1700" compiled by Clarence Almon Torrey; p. 516; The Genealogical Publishing Company, Inc.; Baltimore, Maryland; 1985 (974.0 NEa/Marriage SCGS)