Hi.. Pls Help Me.. I Just Bothered, January-February My Period

hi.. pls help me.. i just bothered, January-February my period did not came, and then on March 24 it came and it stopped at April 1.. I have sex last Apr. 6 and then I took an emergency pill just to make sure that i am not to get pregnant..and then today april 13, i saw that i have a brown spots, that is like my period is about to come.. but its too early to have a period.. is that normal? pls help. thanks