I'm period ranges from 24 to 32 day cycle. Just wondering if this irregular as I'm Ttc for the last 7 months.?

Normal variation. It is normal to have some variation in cycle length because some eggs mature faster than others. Try an ovulation predictor kit. If you are ovulating, this should not be a problem. Do remember that it can take a few cycles to conceive and an infertility work-up isn't in order until you have had regular, unprotected sex for 1 year with out conceiving. Best wishes.