After getting a surgical induced abortion is taking antibiotics really necessary? i don't want to mess up my gut microbiome and never had to take antibiotics before in my lifetime. i take probiotics religiously everyday and never had an infection.

Depends: If you were actively bleeding and passing tissue prior to your procedure, then yes because then your cervix was open and you were at increased risk of uterine infection. If you were not bleeding or passing any tissue at all, and had no fever prior to procedure, AND You were told the procedure was smooth with no complications, then antibiotics are generally not needed. Can always check with your DR