In March, I had protected sex during my supposed ovulation date. then i had protected sex again in the same month, two days before my period came. Then, well yeah, my period came. About two weeks ago (in April), I didn't have sex but I took Postinor-2 after fooling around, just in case. I took a pregnancy test after that and it came up negative. My period came a week after that. However, it has been relatively lighter than usual, although it's neither longer nor shorter. My average period length is 5 days and I finished in 5 days. What are the chances that I'm pregnant? Could the lighter bleeding be from the postinor-2?