The blood type itself does not affect conception, but a positive or negative Rh factor can cause problems.
If one of the partners has a negative Rh factor, and the second has a positive one, then there is a 50% risk of a Rh conflict.
Why the Rh conflict is dangerous: the woman's immune system perceives the fetus as a foreign body that needs to be disposed of, this can provoke developmental defects and miscarriage.
In this case, you need more careful medical monitoring of pregnancy. Also, doctors can prescribe immunoglobulin injections to mom so that the baby develops without problems and is born healthy.
In the first pregnancy, the probability of Rh-conflict is lower, in subsequent pregnancies, it is higher. Even at the planning stage of conception and pregnancy, you need to know your partner's blood type and Rh factor in order to better understand what to prepare for.
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