Exactly. And there's no evidence that it's an abortifacient, either. So, about 95% of the uses are unnecessary.
http://www.cmda.org/index.cgi?BISKIT=216935661&CONTEXT=art&art=2360#art1
This...
"The reason I am still wary is the evidence that the "luteal" phase of the cycle - the time from ovulation to the time the woman starts shedding her uterine lining - is shortened in some women. If the lining is shed early, I can't be sure that there could not be a loss of an embryo which is beginning to implant."
...admits the possibility that it could be an abortifascient.