Validity of my my visa!

Hi I'm a Filipino citizen. My madam bring me here for the third p. First is on February, second is on march and last is on june. I'm working in Singapore and my madam is a Chinese citizen. But before that when we are applying in Singapore, the embassy said that I can only enter china twice in a year but I still entered china. My visa will expired on july5 how if I will stay here for a few days or a week without renewing my visa will it be the cause of charging me for overstaying?