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Heightened sense of smell. A missed period. There are dozens of pregnancy symptoms we are familiar with. Many of the traditional pregnancy indicators are not unique to pregnancy, and often present the week of a missed period or in the weeks following. For many women, the time spent waiting for delayed menstruation (weeks after trying to conceive or when you think you may have become pregnant) can seem like a lifetime.
So, as women's levels of estrogen rise and fall, their sense of smell may change. There's evidence that a woman's sniffer also changes during her menstrual cycle and at ovulation, as well as during pregnancy [source: Sample ].But scientists aren't exactly sure how (or if) estrogen creates the change in the nose or in the brain [sources: Harvard Women's Watch, Pletsch and Kratz ].Scientists also debate whether a pregnant woman's heightened senses serve any benefit to her or her unborn baby.ut scientists aren't exactly sure how (or if) estrogen creates the change in the nose or in the brain [sources: Harvard Women's Watch, Pletsch and Kratz ]. Scientists also debate whether a pregnant woman's heightened senses serve any benefit to her or her unborn baby.