u r suffered from oligomenorrea, in this condition u r periods is more than 35 days, there are some causes for this symptoms , u should do that, thyroid profile , serum TSH, T3, T4, AND WHOLE ABDOMEN ULTRASOUND
. N SERUM ESTRADIOL
, SERUM FSH N LH AND SERUM TESTOSTERONE
till then u can start oral contraceptive pills
, (ovral) for 2 months, if u have any abonormality in these test then consult ur doctor or let me know..............