Hi, I have a single entry visa and are in China now.

My friends want me to visit Macau but I fly out of Beijing.
Everything I've read says I cannot re enter China because of single entry already been used when I arrived.
I got caught out with this last time I was in China when I visited Hong Kong for 2 days and couldn't re enter. I had to get a new entry permit which was a major Hassel in Hong Kong.