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The lead says, "In mice, pregnancy can only be terminated prior to embryo implantation..."
Problem: Pregnancy is defined as beginning at embryo implantation. You can't terminate what hasn't started.
I'm not sure how to re-write this to be accurate. The concept to be conveyed is that this effect can happen only somewhere in between conception ("Day 1") and the start of the pregnancy (day 4 in mice; equivalent of day 6 post-conception in humans or what's called day 20 on a last-menstrual-period basis). WhatamIdoing (talk) 22:12, 25 April 2018 (UTC)[reply]
