Yup, all normal. My hair kind of did the same thing, but now (after pregnancy) it is thicker and healthier than ever.
I have no idea how to balance high school and pregnancy. Others on her have or are doing it. I'm sure they can give you some tips on how they managed. My advice would be: Don't use your pregnancy as an excuse for not being able to do things. Don't expect people to give you special treatment. Just work hard. I would think that being in school while your pregnant would be the easy part. Just imagine when you have to get up during the night for feedings or a fussy baby, and then get up and get yourself and a baby ready so you can make it to school on time. Then when you get home you need to do your homework, but the baby needs to be fed, changed, and cuddled. Wow! I honestly couldn't imagine!!! I work and have to be there at 8:00am, and have a really hard time getting everything I need to have done.
I wish you all the best and congrats on finially getting everything straightened around with your families.