Fertility and Abortion

Why haven't the pro-lifers gone after fertility treatments that produce unused embryos? With so much attention paid to ending abortion and stemcell research, why isn't there more of an uproar over these "cast-offs?" Not only are they are ultimately destroyed, but insurance covers the procedure. With the pro-lifers wanting to restrict where fed dollars can go, this also seems like a viable target. Is this an under the radar issue, or is it a loser for the pro-lifers due to go forth and multiply and or who want's to come out and tell a husband and wife you're against them having a baby. In any case I think the pro-lifers are in a jam here. Any thoughts?