On birth control and take as should. sex on 11/16, 11/19, 12/2. last period 10/30. took test on 12/7 and negative. could i be pregnant?

Possible: There is a small risk of pregnancy even when bc pills are taken consistently, and most pregnancy tests are reliable by a week after missed period, so the 12/7 test should have been reliable, but a repeat test with concentrated urine would be advised. Some women who have been on bc pills for a while experience very light periods or none, and that may be the case.