Another friend on Diaperswappers is in the same boat. We've been looking around. Apparantly the test I took is 50 mIU sensitive, but at 13 DPO I should be btwn 17-48. So, yesterday's test could have been slightly more sensitive & I could have had a better concentrated pee. (I had soup for dinner followed by at least 3 glasses of caffiene free soda & a cherry coke at the movies, last night.)
So, the plan is to go get some tests that have a better sensitivity & try again.
I'm not going to even BELIEVE that I could have miscarried or had a chem. pregnancy. I am just going to take some more tests.