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Some studies show nausea during pregnancy can be caused by low progesterone levels- progesterone is your important pregnancy hormone- You can get a progesterone cream over the counter at a health food store- do not accidentally pick up estriol- it is estrogen- when the baby is ready to come out estrogen levels rise quickly and contractions begin.
Magnesium deficiency also can cause nausea in pregnancy as can B6 deficiency- when you take one B, take the whole complex- B50 at Walmart even- should help. 400 mg of Magnesium also- if you can't keep mag down, take a warm bath in epsom salts- magnesium sulfate- it will absorb through the skin.