When to try to concieve

Ashley • Loving my life drama free been with my man for eight years getting married next year we are trying to consieve our first child I go to college and work full time love making descent friends
Okay so I'm very irregular and just got my period which seemed like it took me three till four months how soon should me and my fiance try to concieve? I bought ovulation tests but even if they do say it's time it feels like a waste of money we really want a child so please help us and don't be rude or over exaggerate in my comments or it will be hidden I don't want too much of my business on here please be respectful thank you