If our parents used fertility treatments to concieve us, are our bodies artificial by it?

My husband's parents used fertility treatments (many) to get pregnant as did my parents. We are 24 and 25 and own 3 kids already. It seems approaching every 9-10 months I get pregnant. (Obviously, contraception would help out with this issue, but we are dead set against it, which is really beside the point). I want to know if treatments used to concieve 25 years ago are making us more fertile? Is there any proven research on this that someone can point me to? Thanks There is no general answer; one would requirement to know the exact treatment involved, or at least the drug.
However, it's unlikely. Fertility is a complex mix of factor, including some as random as diet and stress, to the blatant such as exposure to radiation. I am fairly over the medical literature and have never hear of a fertility increase being passed on to a daughter via a mother's treatment.
It's more potential there are other explanations:
1) you or the father may be younger consequently they were. Age have an enormous relation to fertility.
2) you or the father may be in good health than they were. Health (and stress and diet) enjoy a relation to fertility.
3) the father may have greater sperm count/motility than your parents or your husband's parents.
4) you are experiencing normal statistical variance within pregnancy, but (to you) it seems close to it is highly unusual.
and so on.
My bet, minus knowing more, is on #2 or #4.

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