What do you mean? How long after Ovulation/Implantation?? Normally 2 weeks, but its best to wait untill your period is due personally, then test with First morning urine
(You have more HCG in the morning so its better) Whereas they have enough in their blood (This DOESNT indicate a problem btw) Just the way the body works., If you suspect you're pregnant and havent got a positive on a Home Pregnancy Test you can always ask your doctor to do a HCG count?
sorry i didnt explain myself very well, i was wondering from the time of a missed period whats the longest people have had to wait before they got a positive home preg. test. im 6 days late test says neg. never been this late