What Causes Pain In The Back And Twitching In The Abdomen Having Ortho Evra Patch?

Okay, Ive been on the ortho evra patch for about eight months now, and I have been having unprotected sex for about five months. I have never felt the way that I m feeling now! It feels as if something is floating around in my stomach. I have slight pains in my lower and upper back. The bottom right side of my belly sometimes twitches. I have had slight headaches for about a week now but the pains are very short and mild. For some odd reason, I have been crying a lot lately and people have been hurting my feelings. My boyfriend say that I m always jumping the gun now. I m always catching attitudes with him for no reason at all... My breast have veins appearing in them also. I sleep a lot, which is something that I ve always done. I have took 2 pregnancy test within the last month and they both said negative. My instincts are just telling me that I m pregnant. Could this be?