I have 2 <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> one says 20 something says late this one says 30 something days late... in the past when being this late I would take test they would all come back negative and it always upset me. I have pcos and Endometriosis I started taking metformin for it all including my diabetes in march. I have an appointment with my ob on the 19th of October? Or should I test?