I remember reading that if you have an excessively high fever during the initial stages of pregnancy it can hurt your chances of conceiving because the zygote/embryo needs protein to survive. But I don't remember how high an excessively high fever would be (what's problematic, and what is ok)... I personally had a slight fever this last 2WW, but did conceive anyway. Whether it sticks or not is something else entirely, however.
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