4 preg test all came back negative... pregnant?

Hi,
Welcome to ehealthforum,
The emergency contraceptive pills give you protection for next 12 hours (after you take the last pill). If you have been sexually active after this time, you can be at risk for pregnancy. The bleeding that you experienced after few days of taking the ECP could have been the withdrawal bleeding. If you had been sexually active after your withdrawal bleeding, chances of pregnancy are a possibility if ovulation occurs around the time of your sexual contact. The lighter periods/spotting that you describe could be suggestive of implantation bleeding or decidual bleeding (if you are pregnant). If you miss your periods, or if you have abnormal periods, or if you develop any new symptoms suggestive of pregnancy, or if periods have not started within 10 days of expected period dates, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle.
Take care.

doctor,

i had protected sex with my boyfriend on 5th day of my cycle and i had an i-pill with in 72 lets say at approximately within 55 hrs... we did it on 22nd of this month and then now yesterday i have my periods again.... y am i having period exactly a week after i had the i-pill??? is it some side effect or some other reason ???