Mira?

I’m 34 and ttc my 3rd child. I’m moving into cycle #5 with no luck thus far. I thought for sure last cycle I was going to get lucky 😕I know everyone is different and it isn’t easy to get pregnant. So far I have been going off of my body and using pregmate ovulation test strips. I don’t want to let this become an obsession but I can’t help but feeling disappointed and confused why it hasn’t worked thus far. I do have a heathy diet, take regular prenatal and I’ve recently just started working out again a few days a week. I’ve been seeing ads for the fertility monitor, Mira. And I am considering it. Has anyone used this and had luck? Is there anything else anyone would recommend? What am I doing wrong here. A little help or advice would be appreciated ☺️