Rhesus (Rh) factor is an inherited protein found on the surface of red blood cells. If your blood has the protein, you're Rh positive. If your blood lacks the protein, you're Rh negative.
Rh positive is the most common blood type. Having an Rh negative blood type is not an illness and usually does not affect your health. However, it can affect your pregnancy. Your pregnancy needs special care if you're Rh negative and your baby is Rh positive (Rh incompatibility). A baby can inherit the Rh factor from either parent.
Your health care provider will recommend a blood type and Rh factor screening test during your first prenatal visit. This will identify whether your blood cells carry the Rh factor protein.
If you're Rh negative and your baby is Rh positive, there's a potential for your body to produce antibodies that could be harmful during a subsequent pregnancy.
If you're Rh positive, no action is needed.
https://www.mayoclinic.org/tests-procedures/rh-factor/about/pac-20394960
That's all I ever knew about blood type.
Turns out in Japan, it's like your horoscope.
https://youtu.be/GPhEgtChaag
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