1. Factors that determine how long it takes to get pregnant after a spontaneous abortion. The time it takes to get pregnant after a spontaneous abortion varies from person to person and is affected by many factors. Such as age, physical condition, cause of miscarriage, etc. After experiencing a miscarriage, women should wait for a period of time to allow their body to recover. The specific time should be determined by the doctor based on individual circumstances. 2. How long do you need to wait to become pregnant after a spontaneous abortion? Typically, doctors advise women to wait at least a month after experiencing a spontaneous miscarriage before trying to conceive.