This article has been moved over to Wikipedia and will soon be deleted if the Lord is merciful.
You can see the article here: Wikipedia:Threatened abortion
A threatened abortion is a type of abortion that happens when there is bleeding with or without cramps or low back pain. With such a presentation of bleeding, 50% proceed to abortion of the pregnancy.
Management of these patients involves an examination to assess for cervical dilatation, an ultrasound to assess fetal viability, bedrest (though it has no proven benefit). No hormones or medications have been shown to prevent abortion.