I feel like a bad mom sometimes..

I’m 25 weeks pregnant and I also have a nine month old.. some things that happen I feel literally so guilty about. I know babies get hurt and stuff but it bothers me like I could’ve done something to prevent it.. like today my daughter was in the grass and my moms boyfriend walked up and accidentally stepped on her leg and about fell over like she didn’t see her.. I don’t think it hurt her, just scared her. And then some random old lady came up and grabbed her cheeks and kissed her on the mouth. Why didn’t I say anything? Cause I was in shock I’m guessing? I don’t know. It literally makes me sick to my stomach and gives me such bad anxiety thinking about it later. I just feel awful and like I could do stuff to prevent these things 😞😞 but then I don’t know if it’s hormones.. any advice?