Actually They do not care whether you have applie for AOS
or not. As long as you have a valid VISA, they will let you in.
But they have access to the INS database to check your status if they are suscipious about you. if they ask you especially have you applied for AOS, you should not lie, you have to tell the truth and tell them I am yet get to my AP and EAD, if you have the Receipt for your I485 you can show it to them, but tell them I would like to enter using my H1B rather than my I485 politely . Do not antogonise them at any point , because they can spoil your life for ever. If you are so concerned, you should consult yr immigration lawyer before your abroad trip. Because I did the same and my suggestion is out of experience only and not a guidance.
Hope this helpful.
Aditya