pregnancy has ruined my curls!

Sarah • 27. Married. My son was born 2/22/16 and his little sister 7/5/17
Hey ladies so, I've always had curl hair (more wavy than curly I suppose) anyway whilst pregnant with my boy my hair was great, now that I'm into my second pregnancy I've found that my beautiful waves are loose and frizzy, I'm in the cosmetology field so I know the proper haircare for my curls, I know pregnancy tends to change hair in many ways, my question to you curls girls are, has this happened to you, did your curls return postpartum?