From my experience and research, though please don’t quote me on it because I am not an expert, you need to take birth control pills roughly the same time every day in order for them to work to their fullest extent within you. Depending on how late you are the pregnancy hormone may not yet be strong enough in your body to show up on a test. I would suggest waiting at least a little bit longer and buy two tests. What I did when I was pregnant was take the test as soon as I woke up in the morning without going to the bathroom first. This way if the pregnancy hormone is in your system, it is in a greater quantity in your body and isn’t diluted by water or other fluids. Regardless, don’t do anything like smoking or drinking until you find out. Most of all, don’t stress yourself out too much, at times your mind can be your worst enemy! Best of luck and it never hurts to go to the doctor!