Suggest Treatment For Infertility

hi..i am 23year..old..i am merried..i am traying for baby..last2..year..i use ovulation kits as well..but my period is not in time..all ways is long..some time 35days..some time.43..days..that way i am not sor ven is my ovulation..this time..my period..was..22..january..2011..and..43..days cycle..bcoj my last period was at..11.december..piz..help..me..to fiend best time to have sex..and..why is my period..to long..i hop u will ans..thanks