The fallacy in the statement is called "Invalid Analogy." An analogy is when two things or situations are compared to highlight similarities between them. In this case, the person making the argument is trying to equate the use of fertility drugs to the act of abortion.
However, the analogy is invalid because the two situations being compared are not truly equivalent. Fertility drugs stimulate ovulation, increasing the chances of multiple embryos being conceived. While it is true that in some cases, one or more of these embryos may not survive, it is not the same as intentionally terminating the growth of an embryo or fetus through abortion.
The person making this argument is trying to criticize the inconsistency of anti-abortionists who are against abortion but not against fertility drugs. However, the argument ignores the crucial difference between the two actions. Therefore, it is a fallacy of invalid analogy.