I am 11 days late on my period. I have taken multiple pregnancy tests which have all come back negative. One of which I took this morning, exactly 11 days after my missed period which was negative, and I took a urine test at the doctor 2 days after my missed period which was negative as well. I usually take birth control every month but I was not on it this month and I also took Plan B this month. Is there a chance that I could still be pregnant after so many negatives or is my period irregular because of the plan B and the inconsistency in my BC

