The length of time that a woman experiences active miscarrying will vary. Some women bleed heavily only for a few hours; others will experience spotting or bleeding for days or even weeks.

A premature birth is a birth that takes place more than three weeks before the baby is due.

Sexually transmitted infections such as chlamydia and gonorrhea can cause fallopian tube damage.

Low sperm count can be caused by a number of health issues and medical treatments. Some of these include infection, undescended testicles and varicocele.

Many women with endometriosis have pelvic or abdominal pain, particularly with their menstrual bleeding or with sex. Some women have no symptoms.

Emergency contraceptives are not as effective as birth control that's used before or during sex, like the pill or condoms. So if you are sexually active or planning to be, don't use emergency contraception as your only protection against pregnancy.