Mic, today is ur d11? U can test if u want to. It can be very faint if u BFP. But if u dun see anything does not mean gone case too. So, is really up to you if u can take the stress. Generally, a safe bet is test on D14. In most instances by then, u will be able to see positive even if hpt shows faint lines.
These days lots of HPTs r very sensitive, even cheap guardian ones are as cheap as 8 bucks for 2 sticks n can detect sensitivity of 25 onwards. The only diff on these cheap ones to ex clear blue is the cheap ones may take up to a few minutes b4 the positive sign is out regardless on the hcg concentration level in the urine.
But if u see brown spotting, it can be implantation blood or it cld be u are already preg. So, u must do HPT. Positive go down KKIVF for early BT n if BFP, u will be given additional support.