With my m/c in June last year at 5w 4d, I never got my first +'ive until 15DPO and that was faint with FMU, when I fell pg again in Sept last year, I again tested with FMU, but this time I was 10DPO and got a faint :bfp. Sadly, this pg'y also ended with a D&C on Oct 26 at 7w 4d.

FMU is definately more concentrated and will show up little amounts of HCG, if u r testing early.

Goodluck.