Ok so on around February 3rd and 15th I had unprotected sex. He didn't finish in me, and it was more of an in and out situation (tmi). But my period was supposed to start February 26th. Last month I took a plan B (not sure if this messes with my period). Two days ago, I took a rite aid brand test. It came back negative after the allowed three minutes, but around an hour later it came back all messed up with a half line positive line. I did the test by inserting it into the urine stream and i did get some on the display. I googled the test and some had a false positive with it. Yesterday, I took two ClearBlue digital displays and they came up not pregnant. Today I took two first response early pregnancy tests and they both came back not pregnant. My last two periods had around 34 days in my cycle. Before that it went between 18 and 39 days. I have been very thirsty and having stomach aches lately. Any idea of what this could mean