I wonder if I have a sibling I don't know about

Date: 18 Jul 2020 to 18 Jul 2021
Location: Utica, NY, maybe
Surname/tag: lillian philipson blumberg; abraham charles blumberg

One of my aunts told me that, before they got married, Lillian Philipson and Abraham Charles Blumberg had broken up. Lillian stayed in Utica, NY, and Abe went back to school in NYC. Then Lillian and Fanny Dubin Philipson, her mother, went to NYC and demanded that Abe marry Lillian. In those days, the only reason for this would be that Lillian was pregnant. Abe complied, and they got married.

I was born in 1953, 8 years after they got married. I wonder: do I have a sibling who was given up for adoption? Did Lillian have an abortion (almost unthinkable back in the 1940s)? Did Lillian have a miscarriage? I would LOVE to find my sibling, if I indeed have one. He or she would be 75 years old now; I'm 67.