Hi, I am of 21 years unmarried girl, my regular days are from 21-27 of every month and I got my periods on 23rd sep which ended on 27th and on 28th sep I had sex without protection but within 72 hours I took that unwanted 72. On 5th and 6th of october I again had periods but this time it was brown blood. On 16th october I again had sec without protection but he ejaculated outside on that time I didn't took any medicine. Now its 7th november till now their is no sign of periods. And I did the test also today in the morning but the result was negative only one pink/purple line appeared in the box. Can the results be false? Or something else is the reason of not getting my periods on time? Pls answer.