ovulation kits? yay or nay?

do any of you lady trust the ovulation kits. I just feel like I need help on seeing when I'm ovulating my periods are not normal so my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> Arnt that much of help. & we are trying to have our 4th baby.