Should I Fix my Umbilical Hernia Before Pregnancy or Wait to Repair It After Giving Birth?

I am 37 years old. 2 years ago I was diagnosed with umbilical hernia on the 31 week of my last (third) pregnancy. My OB said she will try to repair it during my c-section but she was not able to reach out and do it from the c-section incision. Now I would like to get pregnant, should I fix the hernia first or should I go with pregnancy and birth then does the hernia repair???