Been trying everything no answer:(

​I need advice so I've been told by my doctor to by ovulation kits so let me know when I'm ovulating so I've been doing that and it does not help me every time I believe I'm ovulating or my glow tells me I am I take a test and it tells me No Lg or it just doesn't give me a answer and worst part I never know when I am ovulating just because my period is eregullar. And I also don't want to keep Waisting $16.00 just for those kits that aren't really helping. My husband and I are really trying to have a Baby but it seems like it isn't working and I'm getting to my breaking point and just want to stop trying. :/ idk what else to do can someone please help me and give me advice.