It's a good question because there are a lot of mixed messages, and certainly mixed responses, out there. More women are staying fit through their entire pregnancy, and some are running/jogging the duration.
There are so many factors to consider: morning sickness and dehydration; how you "carry" the baby (including balance from a change in your center of gravity); the amount of weight you gain; the pain of bigger, heavier breasts if you don't change jogging bras; the pain of bigger, bloated feet if you don't change running shoes; the impact of the extra weight and strain on your blood pressure and heart rate; etc. etc. You may be lucky and not have any of these problems. Or, you may have a difficult pregnancy and at best be able to go for a long walk.
Once you get the good news, be sure to ask your health care practitioner for specifics on how much you should do and then follow that advice. It's very individual because women all handle pregnancies differently.
Also, if you plan to continue running and training for another marathon while obviously pregnant, be prepared for some cheers and jeers. Some runners/spectators will salute you; some will shout "How selfish!" I saw this happen to one woman who was eight months along and jogging her way to the finish of a major marathon.
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