since you mentioned "lessening" nicotine as a option in your post i would really encourage you to start with quiting that completely, it is one of the few things that is known for sure to harm your baby and the beginning counts the most. so whatever help you need to enlist, that would be a really great place to start.
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then prenatal and water and deep breaths, congrats!!!!
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when it comes to the rest, things usually fall into 2 types of risk:
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those that are toxins and you don't want getting to the baby
examples of this are smoking, high mercy fish, things with lots of chemicals in them, prescription or over the counter drugs that are listed as not ok for pregnancy....
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and then there are those that could be dangerous because of what is understood to be a weaker immune system during pregnancy and the risk of infection (it comes as a side effect of the body needed to accommodate a foreign human inside of us without fighting it)
examples of this are raw meat/fish, cold lunch meats, raw cheese, unwashed vegetables...
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this second category is less a definite and more about an increased risk, increased how much is a matter of debate.
i personally deal with the two categories a bit differently, the first set of stuff i did my best to always avoid specially in my first trimester when the organs were forming. i figure a few months is a small price to pay for not worrying about what i was doing to my baby
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the second set of things i researched and worked to understand the real level of risk and also worked hard at keeping my immune system the best it could be, then i mitigated what risk i could (washed all vegetables, microwaved my lunch meat...)
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in the end stress is bad too, so learn and decide but work on not worrying too much. Â
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sleep and water and including the healthy things will go a long way to helping way way more that too much worry over what could hurt.