Hair loss?

Hi, ever since having my daughter 4 years ago- my hair has fallen out. I can’t even brush it without hair covering the sink, it’s always on my clothes, it’s just everywhere. I’m pregnant again, (22 weeks) and it’s just not getting any better. I’ve always taken my prenatal like I should, I’ve even done the big chop and my hair still falls out so much. I’m surprised I’m not bald. My hair is really thick too, but it doesnt matter what I’m doing- I could pull multiple strands out at a time anytime of the day. Is there anything I could do to stop this? Its really discouraging & disgusting because I HATE hair/hairballs etc. 😞😞