-Yes.
這段時間算合法身份嗎?
-Yes, as long as your I-485 is pending.
還是應該馬上轉H-4,
-If you change your status to H4, your I-485 probably will be denied. You had better find a job in the same/similar area and use EAD or H1 transfer to work.
轉了H-4是不是EAD就失效了?
-Irrelevant.