You had the STD treated so the baby should be fine. If it was left untreated it would only cause problems to your reproductive organs or cause miscarriage but your ok and the only other way it could harm the baby is through the birth canal during delivery. You're fine. And for hair treatment if wait until second trimester and make sure you don't put it on the scalp. I'm not highlighting my hair until after delivery. Personal preference
Have it done professionally your hormone can effect the color out come
if you were treated for the std like antibotics im sure the baby will be fine it untreated that would raise a problem . the hair dying is ok but they say to wait until the 2nd trimester and go into a well ventalated room maybe use a 10 minute dye .:)
My ob just told me today to wait until 16 weeks to dye my hair.
did the dr. you were working with know you were pregnant? if so i'm sure he/she gave you baby safe meds. and some women wait til after 12 weeks to dye hair, my OB has told me as long as it's well ventilated and there's a fan on, it's fine to do at any stage of pregnancy.