some advice??

Hi all,
I'm trying for my first baby but a little worried. I haven't had regular periods since I started. I have been testing myself to see if I ovulate and I did in the last week of last month but haven't since. I've had to delete 3 period cycles off my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> as I still haven't started it yet but I'm not pregnant as Ive tested every day. Does anybody have any advice to help my chances of conceiving and also any advice on my cycle or anyone who has the same issue but has managed to conceive?
Thanks