What should I do about my hair falling out constantly after childbirth?

I have quite a lot of hair.

The problem is that my hair started falling out after childbirth~~ It falls out when I wash it, when I dry it, and when I brush it...ㅜ I'm worried I'll end up completely bald.

I intentionally tied my hair loosely.

I am trying to minimize and delay dyeing as much as possible.

I've tried hair loss shampoo, but I don't think it's very effective... Sob sob, I'm really worried because my hair keeps falling out... Should I go to the hospital for a check-up and take medication?