Hi I Have Been Ttc For 6 Months. I Am

Hi I have been ttc for 6 months. I am 36, recently had a chemical pregnancy. Since then I am stuck on a 35 day cycle with my usual being 29 days. Prior to ttc I would douche with peroxide, I did this for about 4-5 months at least one a week. I did this to treat repeat BV. I am now worried that may have something to do with my fertility issues. Also, when does the cycle return after a miscarriage?