I'm currently 2 weeks late on my monthly. I took a test on Sept 1st and it came back positive. Took 2 more the following day and both came back neg. I went to the clinic on Tues the 6th and did a pee test there and it also came back negative. Doctor told me that she wasn't going to rule out pregnancy. I could be just too early to detect. But my question is why would I test positive the first time if my pee test came back neg at doc? I will have to continue my prenatal vitamins and follow up with her in 3 weeks. Anybody else have this happen to?