First, "either Lucketts, which is now in VA" - Lucketts has always been in Loudoun.
The 1930 Loudoun Co. Census shows Agnes Fambrough, age 25, married at age 19, her husband Roy Fambrough, age 29, daughter Frances E., age 6, and son Roy D. Jr. age 3½ living with her widowed father Obid Davis, age 54, in the Lovettsville area.
The Loudoun Co. Marriage Register shows: Obed O. Davis, 22y, laborer, single, b. and resides Loudoun, s/o Jno. M. & Clara V. m. 4 Feb 1897 in Loudoun to Ada S. Loy, 20y, single, b. and resides Loudoun, d/o Jno. W. & Jane E.
There is no marriage record for Agnes and Roy in Loudoun.You might want to check Frederick County or Washington DC marriages.
If you need more information from Loudoun Co. records, email me directly.