Very confused

Mariah
I had symptoms of nausea tiredness and cramps as well as extreme moodiness. so I tested the 28th and BFN. I was due for AF the 1st and she was late so the 3rd I tested again and BFN and then AF showed the 4th. I haven't had any more symptoms since before the 28th. My period was light and short. Now it seems like I pee all the time!! Is it possible that I am pregnant and for some reason it didn't show on the test? I took one clear blue the 28th and the 3rd I was at the health department and they tested me. So it was 2 different brands. Why do I feel like I'm peeing so much? So I guess my question is. Has anyone else gotten there period and still been pregnant even with a BFN the day before period??