Unable to conceive. Is it right?

Hello : This is yogita Singh age 31 years married since 2 years. My husband's age 32 years . We are trying to conceive from one year. From last six months we are in touch each other during fertile window. I basically saw when we give 100 percent in sex. Periods always tends to dealy it happens 5 to 6 times . As my last period date is 7 july but 17 August my period came..normally my period cycle 32-35 days but in a rarest case its takes 40 days to come..so I unable to understand what reason behind this..yesterday I tested by my prega kit it has shown faint "T" line Faint line is showing from last six months it happens approx 6 times. And often period comes after 10 daya delay.. Nd I have no other problem in body..so wht tablets I should take without any harm so that I can make process easily..like many suggests tablets of folic acid,tablets fr increasing progestrone level ..is it right??