•  Your period stops or becomes very light.
•  You may feel nausea or queasiness. Some women vomit. (“Morning sickness” can happen any time of    day -- it may help to eat small meals throughout the day, snack on crackers or toast, or drink juice or    lemonade.)
•  Your breasts swell and may be tender.
•  Your nipples and the area around the nipples (areola) get darker and broader.
•  You have to urinate more than usual.
•  You feel tired.
•  You may become constipated and have heartburn.
•  You may have headaches.
•  You experience mood swings -- feel angry, sad, or happy for no reason.

Want to know more? Go to Early Pregnancy Symptoms.