Internal ejaculation generally refers to the body ejaculation, internal ejaculation are not pregnant physiological and pathological reasons. 1. Physiological reasons: (1) non-ovulatory: internal ejaculation without pregnancy may be the woman is not in the ovulation period. Only in the ovulation period, the sperm and the egg can combine to form a fertilized egg and implantation, will be pregnant. If the time of intercourse does not belong to the ovulation period, there is no dominant follicle discharge, even if the sperm enters the body, it can not combine with the egg, and will not be pregnant. (2) Ovulation: Even if you have sex in the ovulation period, it is not 100% to be able to get pregnant, the natural chance of conception each month in about thirty percent, ovulation in the body ejaculation is not pregnant is also a normal phenomenon. 2. Pathological reasons: the body ejaculation is not pregnant may also be caused by pathological reasons, such as male sperm quality is not good, or female fallopian tubes, ovulation abnormalities, endocrine disorders, etc., will affect the normal conception. If the couple in the case of no contraceptive measures for sexual life, and more than 1 year without pregnancy, we should go to the hospital in time to do the examination, in order to clarify the reasons for non-pregnancy, and symptomatic treatment.