Ive been on birth control for about 6 months now and i get my periods but they started coming later than usual now the flo is still normal i took a pregnancy test and it came back negative but could i still be pregnant ?

Tests are accurate: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.