Supper Axious

I am supper axions to take a test. A couple days ago I had a stretching feeling in my lower abdomen. Then I started to feel lower back pain and pain in the back of my thighs. Now I’m aching all over and Iv been urinating like crazy today as well as feeling some small fluttering and increased smell. But I am not sure when my period is supposed to come. I want to give it one more week in order to be sure but I keep getting the urge to take a test. I’m worried that if I take a test it will come up negative.