Might be pregnant but had bleeding

I tested before the bleeding, because I was having symptoms such as nausea and breast pain. I started bleeding on the 10th which was a day late for me and the blood was really watery and red. I had no clots which is unusual for me usually I have lots. It lasted about 3 days which is about average for my cycle. I still have the nausea and breast pain but have not tested since I thought it was my period. I have to take an x ray tomorrow and I don't want to get an xray if im pregnant I don't know if I'll be able to go out and get a test before the x-ray. do you think I'll be okay to get the X ray or should I let them know that I think I might be pregnant? Thanks so much for your time.