Some unlucky women experience the onset of morning sickness earlier, at around 4 weeks, but on average women will start to experience the symptoms of morning sickness at week 6.

This will be called a tentative truth. Smoking during pregnancy has already been linked to low birth weights, stillborns, and premature delivery. However, the link between smoking and miscarriage is still relatively tentative. Though some studies have found a potential causation link between smoking and miscarriage, by proposing that women who smoke more than 10 cigarettes a day do increase their risks of miscarriage.

Pregnancy tests are designed to tell if your urine or blood contains a hormone called human chorionic gonadotropin (hCG). This hormone is produced right after a fertilized egg attaches to the wall of a woman's uterus.

Two crucial nutrients, folic acid and iron, are always included in prenatal vitamins because most pregnant women don't get enough of them from food alone.

When fallopian tubes become damaged or blocked, they keep sperm from getting to the egg or block the passage of the fertilized egg into the uterus.

Cervical caps/covers are 84-91% effective at preventing pregnancy for women who have never given birth. They are only 68-74% effective for women who have given birth.