How many moms are Rh negative???

I had my first baby last month n the topic of a second child in a few years came up with my fiancé, I was told that if the second child had a positive blood type my body would be likely to reject it therefore causing a spontaneous abortion. Idk what to do because I really want a second child in a few years but I don't want to risk losing a baby. This is making me consider not wanting anymore children. If you are Rh negative please tell me about your experiences and how many children you have, and if you've had any miscarriages because of the condition. 

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