ok it is possible. but 98% of the time women don't have periods when pregnant but there are rare cases in which they do. so to your question. it could be possible sometimes those hpt tests are 100% true. i took 3 here just recently back. i had 2 positives and 1 negative. and see this was after i had a tubaligation done. so i would highly recommend to go see your pcp because if you haven't had a period since november i would think you would be. but this way they can do a blood test which is more accurate. when i took a test with my daughter it took 30 minutes to read and than it was extremely faint so when i went and had the blood test done it was positive and accurate. hope all turns out for the best for you and i really hope i was some kind of help. good luck.
my last period was nov 8. i took two hpt that were negative. could i still be pregnant? . i drink lots of water and have regular cycles