Scar tissue in uterus?

So I just went to my doctors appointment today, I’m 23 weeks. He says he wants to schedule an ultrasound with me for 30 weeks because at my original ultrasound at 18 weeks it showed that I have scar tissue inside my uterus. He said right now he doesn’t think it’s affecting the baby but wants to get a better look, and didn’t really say much else. This is my 2nd pregnancy, first baby was delivered vaginally with no complications. What could all of this mean for our little one?