What are my chances of getting a BFP?

AF was supposed to arrive yesterday 7/29 and still has not showed. For the past week I have been having pelvic pains, mainly on my right side but I have felt a few on my left as well. I also have lower back pain with it. Today I feel like I have to pee every 10min and feel bloated along with pelvic and lower back pain. I have also had hot flashes the past 2 days. I took a One Step pregnancy test this morning and it was negative. However, I did not use first morning urine. Is there a possibility that I could still be pregnant or is something else going on?