Miscarriages

I've had seven miscarriages and unfortunately I haven't yet had a healthy pregnancy, I'm in my early twenties and have been ttc for a few years now and wondered if anyone had experienced anything like this and if so do you have any tips?
I've just started using this app and really hope it helps!
I'm desperate to be a mum and it's all I really think about!
I do have hormone problems one month they are over active the next they are under active however I do have medication for this problem, I've had every test possible and everything seems to be ok!
Will I ever have a healthy pregnancy or am I just going to be heart broken again?