Among women who know they are pregnant, the<unk>  rate is roughly 10% to 20%, while rates among all fertilized zygotes are around 30% to 50%. A 2012 review found the risk of<unk>  between 5 and 20 weeks from 11% to 22%. Up to the 13th week of pregnancy, the risk of<unk>  each week was around 2%, dropping to 1% in week 14 and reducing slowly between 14 and 20 weeks. The precise rate is not known because a large number of<unk> s occur before pregnancies become established and before the woman is aware she is pregnant. Additionally, those with bleeding in early pregnancy may seek medical care more often than those not experiencing bleeding. Although some studies attempt to account for this by recruiting women who are planning pregnancies and testing for very early pregnancy, they still are not representative of the wider population. The prevalence of<unk>  increases with the age of both parents. In a Danish register-based study where the prevalence of<unk>  was 11%, the prevalence rose from 9% at 22 years of age to 84% by 48 years of age. Another, later study in 2013 found that when either parent was over the age of 40, the rate of known<unk> s doubled. In 2010, 50,000 inpatient admissions for<unk>  occurred in the UK.
Miscarriage
Ectopic pregnancy
Recurrent miscarriage
Implantation bleeding
Stillbirth
Forced pregnancy
Dry sex
Pregnancy loss