This might help you get started, this is from Vital Records of Harvard, MA, to the Year 1850, Boston, MA: Wright & Potter Printing Co., 1917:
Marriages, Pg 229;
Albert of Lunenberg and Lucy W. Conant, int. Apr 16, 1836
Betsy of Ashby, and William Conant, int. Nov. 7,1814
Simri and Adaline Conant of Littleton, int. Mar 15, 1840
Susan and Phineas Conant of Stow, Apr. 16, 1807
One of these probably has a family connection, as my research has shown that the various branches of the Conant family tended to remain in the same areas, with only a handful moving to other locations.