I have been on birthcontrol for 4 months now and the first 3 months I did not get my period, just rare spotting. Then last month I did not get my period at all, and I was supposed to get my period yesterday again but I have not gotten it yet. I took a pregnancy in the evening and it came out negative. I have unprotected sex around when my period should be, but where I had spotting. The first month, second, and third I took one "period" pill 2 hours late each month. this month I have never missed or taken any even a minute off. Could I be pregnant? Could the test have been inaccurate because of me taking it at night?