im a little overweight and irregular cycle! i want to concie

hi ! im 25 and 2 months back i i found that i am also the one who are suffering from polysystic ovarian syndrome . i have a child 3 yrs old and since 1 year i have been trying to concieve my periods were never regular but . after i got married i concieved after 8 months i never used contraceptives. now i want a child desperately cause i think that my three years old boy needs a sibbling . im 5 feet 3 inches and im 130 pounds im not able to loose weight . im taking glucophage. please help me out of this