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

It is likely due to the plan b and the change in birth control. Both of which can alter your cycle at first. Wait and see what happens when you would expect your next period.

Is it likely that if I were pregnant it would be showing up on a test by now? Again it has almost been 2 weeks since my missed period.

It is likely due to the plan b and the change in birth control. Both of which can alter your cycle at first. Wait and see what happens when you would expect your next period.

Is it likely that if I were pregnant it would show up on a test by now? Again, its almost been two weeks since my missed period.

Usually you would show a pregnancy by this time on a test. It is likely just an off cycle because of the situation, but see what happens in the next few weeks when another period would be expected.

How should I go about taking my birth control again? Should I start taking it now or should I wait until after I have my period?

Start it back up after your period as you would when first starting. Either refrain from sex until that time or be sure to use a condom.