Hello guys

Im freaking out because im 30 days late, I’ve taken MULTIPLE pregnancy tests, gone to the obgyn May 21st for a urine test came back negative, NEVER HAVE I EVER missed a period. Could i possibly be pregnant? I went to planned parenthood to get a blood test done today and it came back negative as well, are blood test accurate? Is there still a possibility of me being pregnant???? At this point im losing my mind. I started birth control april 6th for the first time but stopped taking it on April 29th to see if my May period would come i had sex april 28th but it is now may 29th and absolutely no sign is this normal? Please ease my mind, i am 21 yrs old.

Thanks and blessings