TTC Questions???

Jessica • Still TTC baby #1 been I will keep the faith
so me and Fiance are ttc and my cycles are sooo irregular because of my PCOS. I havent had one since I was about 17 now 21. it just came on in may Ive had one since. some days its on some days is off then back on when is the best time to have intercourse? we want a baby very badly