Bad depressed mommy

Layah
I feel like the worst human being on the Earth right now. Depression was already kicking my ass today, then (around 8pm) I was trying to clip my 3 month olds nails and I accidentally clipped his finger. The way he screamed... He bled so much... I cried. He's fine now but I can't stop thinking about it. I know it happens and I'm not the only one who's done it but I feel horrible.