In some ways, your body is actually working harder than a non-pregnant woman's body works while running a marathon [source: Murkoff]. This Herculean effort being put forth by your body can result in extreme fatigue. You may find yourself falling asleep on the sofa shortly after dinner each night and needing lots of naps.
Your pregnancy may also be asserting itself through various gastrointestinal issues. The main one is morning sickness, a misnomer because it can occur at any time of the day. Nausea and vomiting are par for the course. If your sense of smell has sharpened, you may need to avoid certain odors because they can bring on nausea. Unfortunately, the trigger could be anything from your co-worker's perfume to your (formerly) favorite meal, and you won't find out until it happens. At nine weeks, many women also experience a lot of bloating, gas, heartburn and acid reflux.
If you weren't already hitting the bathroom to vomit, you may be doing so because you need to urinate more frequently. You're not only ridding your body of your waste, but also your baby's -- plus, your growing uterus is starting to press on your bladder.
Finally, at nine weeks, your breasts are probably starting to feel tender and sore. Time to shop for a maternity bra!