The exact answer varies with each woman and the circumstances of her loss. In most cases of miscarriage or pregnancy loss, a woman's menstrual period should return within six to eight weeks.
After a very early miscarriage or chemical pregnancy, the menstrual period may return as soon as four weeks (or the length of the woman's usual menstrual cycle). After a stillbirth or late term pregnancy loss, the menstrual period might take two to three months to return. No single answer is normal for all situations.
Sources
American Pregnancy Association, "After a Miscarriage: Physical Recovery." Oct 2003. 2 Jan 2008.

