Quick update: Went to dr's, did POAS test there, nothing came up. Took bloods, have an appointment tomorrow to get results. Feeling very confused and upset. Dr said that the store-bought ones are often more sensitive than his, and the fact that I've had 2 positives sounds good to him. In fact, he wouldn't have even done a test there if I hadn't insisted on it. Sigh. Why does everything have to be so difficult?