So I've noticed over the past few weeks that my hairspray won't wash out of my recent hair growth. It turns into a white-ish residue on the surface of my hair. I know your hair can change/grow differently during pregnancy, but surely this isn't related to my pregnancy? I've never had this problem before. Tried a couple of different shampoos, and none so far have been helpful
Re: Hair Residue
I know what you're talking about.. I have really thick hair (pre-preg) and even thicker now.
I find that the only shampoo that works for me (without making my hair excessively greasy or gross) is Pert Plus.
I also find that I can't use product in my hair like I used to
Must be the hormones...again... 
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"Everything happens for a reason"
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This. My stylist clued me into it. I always do it after I've used a lot of product.