C.,
Though I & my husband did not have the same problem as yourself & your husband, it did take us a very long time to get pregnant. In fact we even went to a fertility doctor. To make a long story very short what we had to do was mostly "relax" & not worry about getting pregnant at all. That was my biggest thing. Because I thought I was never going to get there.
Anyway, along with relaxing/not stressing about getting pregnant, we also used the thermometer method. Which if you haven't been told yet, is basically using a thermometer, & every time your temp is up, your ovulating. Well when I was, I would then call my husband to come home, we would do the deed (again no stress with it, as in: "worrying if this time it would take"). And wow before we knew it I was pregnant! It was amazing.
I think also that you can pick up a kit of some sort like this at a local drugstore. Or rather in our case (cause we are over seas) I order a lot of things thru Amazon & Walmart or Target. I have found that a lot of places will in fact ship to us over here. We just have to look at there shipping area first before ordering.
Or do what I did & just buy a regular thermometer & calendar & write it down on a daily basis.
I do hope this information helps you out.
Good Luck to you & your expanding family,
N.