Taking urine HCG test tomorrow at dr. need some advice...experiences and opinions welcome!!!?

[Sheridan]

after suspected implantation bleeding ( light pink and brown only when i wiped for less than 48 hours) I tested yesterday afternoon and got a neg..... my spotting was on the 9th and 10th.

Tomorrow first thing in morning the dr is giving me a urine test, even though i took one yesterday and it was neg.

Is there anything i can to tonight do to make the hormone very strong....or make the test more accure?

if i had spotting 5 days ago would it work???

HELP!