Drumachose baptismal register contain only two children to a Wm & Jane Loughlin before 1830:
Catharine dau of Wm & Jane Laughlin Parish of Ballykelly Jan'y 24 1814
Robert son of Wm & Jane Lochlin, Broglasco, T. Finlagan Feb'y 5th 1823
The address given is Broglasco in Tamlaght Finalagan parish sometimes called Ballykelly parish. Ballykelly is a village 2 miles from Limavady. I would also check the registers for Ballykelly Church of Ireland which go back to 1798.