You can take one if it would make you feel more comfortable. But this is probably just an "off" period. We all have them once in a while.
If you do take one though, make sure you use first morning urine, even if the directions on the box say that it is not necessary. This is because, if you are pregnant, the concentration of the pregnancy hormone called HCG is highest in the morning.
Good luck and let me know what happens.
