I just turned 26. I have an irregular period already, but, my breast has been sensitive for the last couple mths n my nipples even more sensitive to the touch, my stomach feels tight, I gained 11lbs in maybe less than a wk, my lower back has been hurting me more than usual, I have had to make frequant restroom visits, feeling fatigue, n have had a lot of gas. I thought it might be pregnancy but, every test I have taken is negative. I ain't sure if I should see a ob/gyn or not. Is it possible the test could be wrong? I took 5 already