missed periods and obese will i be pregnant?

Hai,

my last menstural period was on may7th. expected periods was on 4th june. but now its a month late. i have PCOS, and i am obese. i am on metformin, no regular periods. we are trying for a baby delebrately. urine and blood test shows nehative. No positive preg signs. very much worried. i need to know is there any chance for me to get pregnant? or to get periods without tablet induced. pls help me know. i am beliving only on god to answere thought the right person. plssssssss...