Postpartum Hair Loss!!

I'm 22 years old and our son is 3 months old tomorrow. My hair has always been so long and thick and ESPECIALLY during my pregnancy. It was so healthy and full and I never lost any strands in the shower or while brushing/drying- it was just perfect all the time. Well my hair right is SO THIN! Everytime I take a shower now I feel like I should be bald when I get out from the amount of hair I lose when shampooing/conditioning. it's embarrassing how thin my hair has gotten and how little of it is left. I need help ☹ Any reccomendations? should I start taking prenatals again? the hair skin and nail pills? a new shampoo?