However, instances of such “failed ” implantations are thought to be rare, even as seems to be the case occasionally with oral contraceptive pills.
البته ،‏ گفته می‌شود که احتمال چنین اتفاقی تقریباً همان قدر نادر است که شخص با مصرف قرص ضدّحاملگی باردار شود .‏