Hi Wendy
You need to start using a couple of sites that although not complete are worth keeping your eye on.
The Lancashire BMD site is where the births were recorded including the mothers maiden name and that is where I looked in the first instance.
Lancashire Births Marriages & Deaths Indexes
Just remember if you are looking for Accrington or the Haslingden Registration District use the Hyndburn Link on the site.
Another site which is going to be amazing once finished is
Lancashire OnLine Parish Clerk Project -
but both these sites rely on volunteers so patience is a virtue you will have to keep.
I also checked out on the census Jacob and Mary in Clitheroe and they had 4 children by 1841 so I didn't think it was the same couple.