Re:
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I have never got a positive pregnancy test and was wondering if there is anything that can be done like diet, supplements, herbs etc to increase LAD numbers naturally.
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There must be numerous diets available that should help you to increase your energy levels and your immunity. If those values increase, why shouldn't the rest? There are many options available, I think. Have you tried to search cz for forums relevant to diets and supplements? They may have a good deal of experience available for consideration. I think that could be a start.
If you can't get pregnant, however, and there are or have been pets in your household, like cats, for example, then that's another story, and maybe we can have a better look at it. Is this your case?