Ladies please any advice?

Summer is here and I'm 17 weeks pregnant! My hair is as dry as ever! Every summer I used to do a treatment like a curling perm after shampoo so that my hair can permanently stay in curls so that it does not Bomb up! (do not have silky hair)However iv heard I cannot use any chemicals during pregnancy is there any other safe ways I can do something with this darn hair! I don't want to look like a cave woman this summer lol🙈