Hi, A 32 Year Old Woman. Have Bin Ttc For

Hi, a 32 year old woman. Have bin ttc for a year now. I noticed that my period have been irregular since this year. Sometimes is 27, another month 30 or 32 even 33 days cycle. I started exercising in may this year, then the period became 28 days again. Until last month I stopped cos I tot my cycle have regularised.i was supposed to see my period on 26th of this month, but I haven't seen until now and today is the 33 days.i wonder what is rong.could be d cycle changed because I stopped exercising? Please help me out. Tnks