Visa exit

Hi.. I was in macau last 2weeks ago and apply a visa to china. I was granted and given 3mons of visa.. Is still possible for me to go back to macau before my entry permit will expire here in china..by the way im already in china planning to go back in macau..is it still possible..i did not use my uturn in macau as well..hope someone can help me..thanks. A lot..Godbless