2nd pregnancy different from 1st?

Re

Anyone else having second (or third/fourth) thats different from others?

With my daughter I lost a lot of hair on my head, it was very dry (like I could probably go a whole week without washing my hair), skin was clear, no migraines.

2nd pregnancy now - super oily skin and breaking out, need to wash hair every day, have had 2 migraines in last week.

Does this mean maybe its a boy?? Or maybe its different every time?