Yes, the earliest you can get a positive is 2-3 weeks after your period, typically more than 4 weeks. (2+ weeks after fertile time) You have to give the embryo enough time to produce enough HCG (about 50-75 ppm) for the test to read. It's also helpful to use first thing in the morning urine, if you can't hold it long enough keep a small disposable container by the toilet.
at 8:53 PM on Apr. 8, 2009