I have been using opks since I lost a baby in april last year and sometimes they are positive for 8 days straight. I'm 38 and worried.?

Unusual. They detect what's called an lh surge which is a spike in a brain hormone that occurs about 24-48 hours prior the ovulation. I'm not sure why you check them 8 days straight. Now that u have it gives u something to worry about. If positive leave at that, do your thing and forget about it. I cannot think of a disease that would keep that elevated for a prolonged periodhave had no 1 check like th.