H1 approved on 16th July and H4 expiring on 30th July 2013


I came to US on H4 on 30th March,2013. My H1B application was approved on 16th July2013 but my H4 is ecxpiring on 30th July 2013 hence I applied for extension well before 30th July and is currently in progress.

Can I go-ahead and withdraw my H4 application, If yes, what will be my status from 30th July to 1st October,2013. If No, what are my options to retain my H1 status.