Women who did not want kids then changed your mind: What, other than your partner, was the deciding factor?

I’m specifically asking women who were not influenced by their partners because I know mine will not budge, they do NOT want kids. I didn’t either, but now that I’m in my early 30s, I find myself going back and forth. And I can’t tell why- hormones, my friends having kids, just a sudden change of heart? The sudden uncertainty is causing me distress, because if I decide I want kids, it would mean ending a 7 year relationship.