Best urine to take a test?

Yesterday I got a faint but very clear positive on a frer with my second morning urine. I haven’t been able to get another positive like that since. I just took 3 different tests with my fmu that all came back extremely faint. I’m waiting for my second morning urine to test again. It seems smu works best for me. I don’t think i‘ve ever gotten a clear positive with my fmu. I feel smu has the best concentration of hcg especially if you don’t drink anything in between.