I don’t think there needs to be a line at all. What pregnant person is waiting 4 months to decide to carry to term? If it’s happening that late, it’s because they’ve been forced to by medical circumstance, not idle fancy. Adding the line just makes it so there are edge cases where injustice can still occur. I suppose it would be just as effective to leave the late term stuff as “for medical purposes only” but I honestly don’t think it’s required.