With the first two scenarios you cannot rule out an ectopic pregnancy. Unless a woman is haemodynamically compromised inevitable abortions can be managed conservatively. The cervical os is open with an incomplete miscarriage. The type of miscarriage is not important, all Rhesus-negative women who have suffered the loss of a pregnancy require anti-D. The risk of fetal loss is less than 5% after visualization of a fetal heartbeat.