H4->F1 process, please PJiang again ! Thanks!

I have the H4 Status. I got the Graduate Assistantship and will work 20 hours every week. I ask all the teachers and may transfer my H4 to F1 firstly.
- Yes, if you have not started immigration petition

My hu*****and submitted the I-140 but his PD (sept,07) is far away from current date of I-485. does it affect my transfer from H4 to F1??? thank you very much!!!