If you lift weights and do moderate cardio exercise, you don't have to gain much and what you WILL gain, will be very toned and actually make you look thinner!!
Re fertile CM - some people have not had great luck with Fertile Cm. It has dried some people up, I think because it contains l-arginine. Some people's bodies take l-arg and start making a lot of testosterone with it and since estrogen and testosterone are made of the same raw materials, they've made testosterone at the expense of their estrogen and their CM dried up! I like EPO from AF-O and fish oil all month long for CM, along with wheatgrass and green tea. If you use Fertile CM and you love it, that's great!
Re Fertilaid, it's a good product altho I think it has a lot more Vit. E than I really like, has a couple ingredients like Maca where we don't have much info about them yet, and it's expensive. Men's One a Day 50 plus has everything you need for swaying except carnitine (you can also give your husband l-arg if you have some) plus it's a lot more affordable.