Mammograms are a key screening tool for breast cancer. But critics say they're not good enough. Salih Dastan/iStockphoto hide caption

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Exercise helps lower stroke risk, but birth control pills and pregnancy can be problematic for younger women. iStockphoto hide caption

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We know it's not really about Mr. Stork. But we might not be up to speed on key aspects of conception. Jens Bonnke/ImageZoo/Corbis hide caption

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Before you get too far along, you should get a blood test for diabetes. Emiliano Rodriguez/iStockphoto hide caption

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