Trying to conceive

Choua
Anyone have any suggestions on what I can do to conceive? Been trying for a few months now since last year don't remember what month but nothing. I'm regular, my period comes every month. As of now it's coming every month still, but different days. I've also had times where I am very nauseous but it's nothing I usually get my period a few days or weeks later. I never know when I'm ovulating. I have ovulating test but I've used them all. Pretty much I'm just playing by ear. Any suggestions please help.