I had an unplanned intercourse on 19th Feb( 2nd day of my previous periods).i had an emergency i-pill within 4 hrs of this incident. My periods which normally lasts for 4-5 days extended from 18th Feb to 25-26 Feb. This time i had a bleeding from 17th March -20th March. Altogether it was lighter and shorter than usual. On the 1st 2 days, i had bleeding with smaller clots but from the 3rd days my bleeding became completely light and discontinuous. On the 4th day, it stopped bleeding but after i went for a evening walk, it bled lightly (spotting) for a while with a mild pain in my left stomach and mild nausea.Then it stopped.i also had an upt by prega news on 20th March, which gave a negative result. Also, to inform, my last dates are 30/11 ,26/12, 20/01, 18/02. I am unable to understand whether this bleeding is a period or it carries any risk of preg? Please help me with your suggestions ASAP.