Losing all my hair!!!

Hey Mommas and Mommas to be! This is my first pregnancy and I am extremely excited I am 22 weeks and my hair is falling out and breaking more and more each week. I have changed my shampoo 3x, tried coconut oil over night on my scalp, vitamins with DHA and Biotin, D3 and Calcium, No heat, Only washing 1x a week. I do any have any idea what I can do to fix this but it’s making me extremely depressed especially if I do try to blow dry and straighten my hair it’s bad… olaplex seems to make it worse thinning wise… ANY HELP… greatly appreciated