We are ttc an with that said, I only use FRER to confirm lines on IC's. FRER can get expensive but I get a few months supplies at once. I trust FRER, with my last mc they picked up my hcg levels (where there was no guesswork in the line) as low as 9. I was having my beta drawn an each draw I took a test to compare. I'd recommend FRER!
When I conceive I have always gotten a positive test 9 days after ovulation. The test is pretty accurate in progression or no progression if I was to miscarry. So these actually helped me knowing which way my pregnancy is going to go.