Hi doctor it's 55 day since i had i pill and yet i didn't got my period. after 10 days taking i pill i got this bleeding which was less then period blood..my pregnancy test is also negative.?

Assuming that the "I-pill" is a variation of the "morning after pill", it has both progestin and estrogen content, so light bleeding is expected a few days after taking it. Delays in ovulation are common with stress (emotional, school, work, etc.) which will also delay one's menstruation. Wait another 7-10 days and obtain a serum HCG test to be certain. Ask your gyn about oral bcp's.