It has 5 days of intercourse how may i know , i am pregnant or not and is there any way for cancelling the pregnancy ?

Five days is too: Soon to tell. You are likely still a candidate for ru486, the morning after pill. This is different than Plan B which is hormones that cange the lining of the uterus. Ru486 blocks the necessary hormone Progesterone leading to the fetus. A pregnancy test will be the only eat to tell and may not be positive for another 5-10 days, good luck.