What are the signs of pregnancy?

A woman of childbearing age who has some nausea (with or without vomiting), some fatigue (feels less energetic), a sharper or stronger sense of smell, mild soreness or swelling of her breasts, and maybe some food aversions and cravings... could be pregnant. Symptoms can occur before missing a period. She can do a urine pregnancy test 1 week after missing her period, to see if she will have a baby.