Hello I'm Jane ...So I had unprotected sex few days to my period and I have an app used in tracking my menstrual cycle and in it is said "period in 4 days and low chance of getting pregnant" and so I still had postinor 2 few days after the unprotected sex and on the 13th of May I noticed a blood stain when I went to pee and I washed off and wore sanitary pad(didn't flow as usual) only for me to wake up this morning to find out there isn't no blood on the pad...is it that I am pregnant already or is it that I'm really menstruating but the flow is not normal due to the postinor effect?