Well, first off, congratulations on your twin pregnancy! You can expect twice the fun, and (of course) twice the work with twin newborns ... when you consider twice the feedings and twice the diaper changes. During your pregnancy, you could possibly even have twice the morning sickness and twice the fatigue. This is especially true during the first and last trimesters, since your body is working harder. You can also expect more weight gain. You get the idea ....
As far as what to expect goes, there is no way to determine beforehand just how much stress your body will have endure. Increased levels of hormones affect women differently, so the experience will vary for each expectant mother. While some women who expect twins will exhibit milder symptoms of fatigue, morning sickness and weight gain, others may experience more discomfort and stress.
It has been noted that women with twin pregnancies actually experience morning sickness up to 50 percent sooner than women with single pregnancies. In your first trimester, you can expect to feel a great amount of fatigue; you may find that you become tired more quickly, or that you feel lethargic and sleepy. Be aware that fatigue can also be caused by other factors -- such as poor diet, work-related stress or even diabetes -- so check with your doctor if you feel your levels of fatigue are extreme.
Lastly, you should be aware that women who are pregnant with twins, or who have multiple pregnancies, are at a higher risk for medical complications such as preeclampsia, gestational diabetes, preterm labor or pregnancy-induced hypertension. Because of this, you will need to visit your doctor more often.
As with any pregnancy, the proper rest, nutrition, exercise and regular doctor visits are important. With a twin pregnancy, those things are even more vital, so be sure to keep the lines of communication open with your physician. Remember: Once your babies are born, you can concentrate on having twice the fun!