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You can actually go into full term with a baby and not know it. Some babies are very inactive, so they mother would have never felt the baby move. Also, some women get their periods still while pregnant. So, they figure the weight gain is from eating too much, or something of the like. When a woman has her period during her pregnancy, that means that she is having a problem and it should be looked into. It's her body's way of saying, "hey! we're having a problem down here!". Also, she must have been big to begin with.