what is considered an irregular menstrual cycle? can a period be considered irregular if it comes 3 or 4 days late? I've been tracking my cycle since last year and I've noticed I'm from 29-33 day cycle. and my period last 4-5 days. I always get my period every month never have skipped a period. I'm TTC for the last 3 months and I'm wondering if something is wrong or if my menstrual cycles are irregular and that is why I have not been able to get pregnant yet? any suggestions?