Hi Doc, My Last Menstration Is March 26, 2015 And

Hi Doc, my last menstration is March 26, 2015 and i have start a new pack in March 28 2015. We have sexual intercourse with my husband between april 2-5, 2015. In that days, i did not take my pill in same time. Im done taking the 21tablet pill and last night i have a very little spot. Is there a possibility to get pregnant? Please advise! im so worried about this. I dont want to be pregnant again.