So I am 7 days late. I'm never late. Always 27 day cycle. I have had really bad lower back pain, that I never have. I have had headaches. And I just all around feel pregnant. I've taken about 5 test. All negative except for one it looked like a very faint positive but it had a small air bubble in it so I didn't consider it. I just really think I am pregnant. Has anyone else had a similar experience?