3. Hormone Changes

Hormone surges cause a lot of the symptoms of early pregnancy. Mood swings are common and may be similar to those of premenstrual syndrome. These hormones can also cause nausea and vomiting; this is commonly referred to as morning sickness, although it can occur any time of day. Extreme tiredness is often one of the first signs of pregnancy.

Nausea Morning Sickness PeopleImages / Getty Images


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