"I had a positive pregnancy test and then a negative one?"

It is possible to have a positive pregnancy test followed by a negative result. This could be due to various factors such as the sensitivity of the test, the concentration of urine, or the timing of the test. It is recommended to retest using a reliable pregnancy test from a pharmacy a few days later for confirmation. It is also important to follow the instructions provided with the test, including using the first urine of the morning for better accuracy. If multiple tests show negative results, it may be best to consult a healthcare professional for further evaluation.