TTC - tips

My hubby and I have an 8 year old son... We want more.... 
I was on depo shot for about 6 years. We made the decision to stop and let nature take over... My cycle wasn't regular till about 6 months ago... I'm starting to become very concerned that were not Prego. 
I know I should make an apt with the OB GYN. 
I am following my ovulation days and we're ttc on those days. Typically we ttc every other day. 
Does anyone have any tips for us? ( besides talking to the doc)