My period started on 25th Feb and I had intercourse that night, just for a few seconds with no ejaculation inside. I took the pill next morning within 12 hours. After that my period went on for 7 days which usually lasts for 5 days. My cycle is for 24-25 days. Going by this, I should have had my period on 21st - 22nd March, but it has not happened. Are there chances of being pregnant?