TTC soon

Stephanie
Hi all!  I'm 28 and new to the group. 
My fiancé and I are getting married in March and plan to start TTC right away. I'm a little nervous due to my PCOS. I really don't have regular periods, maybe every 3 months or so, so <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> isn't exactly easy. But I have noticed a positive change in my body since I started taking prenatal vitamins. 
​I'm a bridesmaid in September for a good friend, and she made a few comments this past weekend about only beng maybe 2-3 months preggo at her wedding. So I'm nervous to start trying right away, but we want a baby badly.  Any suggestions?