Not sure if I'm pregnant

Hey all,

I had unprotected sex on the 14th of November, I was on the combined oral contraceptive and missed the pill on the 14th and took it roughly 48 hours after my last one. I went off the pill at the end of the course, end of November and my period didn't come. So I went back on the pill after 7 days of it not coming and started taking pregnancy tests. They came up negative except for this on the 15th of December which I'm not sure about. I went to my Drs on the 19th of December and they did a test and it came up negative. They have told me to take one on the 29th to confirm that I'm not pregnant but what are the chances that I am?
http://i49.tinypic.com/v60ys7.jpg

Thats the one thats making me thing there is a positive....

Thanks.

If there are several tests, including the doctor's coming up negative a month after the sex, I would say that one test is faulty and the rest are accurate. At one month after conception you should be getting a blazing positive. And, I believe the blue ones are known to give some false positives.

blue tests can be evil and the line is not in the centre, you are not pregnant.

Those blue dye tests are notoriously evil. I would say that if you have gotten multiple negatives after getting that one positive including a test at your drs office, you are probably not pregnant. Good luck; I hope you get the answer you want!