Girls, hello I gave birth earlier than expected, at 34 weeks (started …

Girls, hello I gave birth earlier than expected, at 34 weeks (started bleeding, detachment, they did an emergency CS), I wanted to know, is it possible that someone has experienced this, will second births be even earlier by term? (I know that it's still early for me to talk about this, we plan to wait at least three years, but thoughts about this don't leave and become scary)