Feeling tired all of a sudden? No, make that exhausted. No one knows for sure what causes early pregnancy fatigue, but it's possible that rapidly increasing levels of the hormone progesterone are contributing to your sleepiness.
You should start to feel more energetic once you hit your second trimester, although fatigue usually returns late in pregnancy when you're carrying around a lot more weight and some of the common discomforts of pregnancy make it more difficult to get a good night's sleep.
Fitness
