If you don't know: IVF fertilizes an embryo in the lab and implants it into the uterus. Often multiple embryos are implanted in one procedure to ensure at least one is viable. If a plural pregnancy results, the mother can decide to "cull" the excess. (I don't remember the proper term but abort isn't it because you abort a pregnancy not an embryo)

In any case, anti-choice activists believe that all embryos are people. Which is clearly false since they don't have a detectable credit score.