Chemical pregnancy and AB- blood

Heidi
I had a chemical pregnancy at 6 weeks. I am TTC #1 and been trying for 10 months. Hgc levels are now <2. My obgyn ran several blood tests. I found out that I have AB- blood and my husband has A+. There is a 50/50 chance the baby could have had +blood and I have -blood. Obgyn gave me a shot of Rhogam for any future pregnancies. Anyone else have any similar experiences?