Hello, There are several reasons of irregular delayed period like ovarian cyst/ PCOD (most common), hormonal imbalance, stress/anxiety, thyroid problem, wt gain/extreme loss, irregular eating habits etc. Need to investigate properly to rule out underlying pathology by USG lower abdomen,Thyroid profile, other hormone assay, blood sugar & prolactin level etc. So consult with your gynaecologist at the earliest and take suggestive measures. Proper treatment can only be made by pin point diagnosis. Regularization of period is very much required to conceive early. Pregnancy depends on proper timing of ovulation & unprotected sex. Ovulation occurs 14 days prior to expected due date in regular cycle. Ovulation prediction kit is quite helpful. Avoid stress/ anxiety, take healthy diet with vitamin & folic acid supplements, control body wt by regular exercise and take a sound sleep. Be well.