Filed I-485 based on EB1a, no receipt yet. Can I file another 48

I filed 485 based on EB1a last week and it was received on June 19. No receipt yet, of course. Now I need to file another one based on NIW (both NIW and EB1a are pending). I don't have A number. I know it is very important to add this to your application. Should I wait or on July 1? I am so afraid I will miss this chance. Please help!