About to give up

Jenn • Mom to Tricia (9/25/00), Damian (3/11/03), Genesis (4/20/04) and baby #4 due 12/25/18.
I'm on day eight of the flashing :-) and I never see a solid :-) 
I also use the ovulation strips and I never see the line getting any darker. I test 2 times a day with the strips and once a day (morning) with the CB ovulation strips. It will go from O to flashing for a random number of days and then back to O. 
Long story short I've had an IUD for the last 12 years and I never kept track of my period before then because I had two kids very quickly and close together at 18 and 19. So I never kept track from 12-18 and then 18-20 I was pretty much pregnant.... And then the IUD for 12 years. 
I'm trying hard to learn my body but I just.... Don't. I feel like I'm wasting time and it's never going to happen.