My last period was February 10 and my cycle is 28 days. This month my period did not come, but on the 11th I used the bathroom before bed and there was a very very light spot of pink on my tissue I thought I had started so I put on a pad. When I woke there was nothing on my kotex. Yesterday around dinner I experienced the same thing. I have also had slight cramping. I took 2 pregnancy test but they were both negative. Could the test be wrong? Is there a possibility that I could be pregnant?