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Four children are a sufficient family I think, especially when you are having deranged renal profile.
It is risky to be pregnant in presence of renal failure
, there are toxins in the body to which fetus would be exposed, risk of abortion
and bleeding are high.
If you still want to get pregnant then you should be in constant follow up of a nephrologist
diseases cause anemia
due to lack of erythropoetin hormone, ensure that you have more than 10gram of Hb. before getting pregnant, take less salt in diets to avoid fluid overload.
Wish you a great health!