Possible Visa Extension

I currently have a dual entry approved visa and stayed in China for 29 days then travelled to Hong Kong for 4 days and will return to China soon, thus using the two allowable entries. I went to Macau for the day and back to HK and now that means I have used the number of approved visa entries. Does this mean that when I attend the airport to return to China for my next 29 day visit, I will be refused?