I am 21 days late on my cycle I have done many at home test and all have come up negative so I went to the dr on when 31 of October 07 and they did a pee test that also came up negative went to the dr Friday 2 nov because I had a clod and the also did a pee test that came back negative I am just wonting to know is there still a chance that I am pregnant or not

The only way to be 100% sure is if you go back to the clinic and have them to a serum blood test. Through blood testing, they can detect the baby hormone HCG in as little as 1-2 days after conception. Urine pregnancy tests are pretty accurate in the clinical setting, but if you want to know for sure, do the blood test... best of luck.

There is always a chance... women build up HCG at different levels and different rates. You just may not have enough to register on a urine test.

I would definitely request a blood test.