Change to F1 now if I were you!
Reason, if I-140 is denied, your I-485 will be denied automatically and instantly! This could be a problem for your hu*****and to renew his H-1B or change to other none immigrant visa (no one is sure on this, I think). In return, you might have problem to renew your H-4 or change to other none immigrant visa by that time.
F-1 could be an insurance for you to stay here for your degree after your I-485 is denied, I believe!
Good luck!
Reason, if I-140 is denied, your I-485 will be denied automatically and instantly! This could be a problem for your hu*****and to renew his H-1B or change to other none immigrant visa (no one is sure on this, I think). In return, you might have problem to renew your H-4 or change to other none immigrant visa by that time.
F-1 could be an insurance for you to stay here for your degree after your I-485 is denied, I believe!
Good luck!