strange pains

Hello,

    My question to you all are, I am 38 and just had a pap smear with the doctor and was told I was NOT pregnant. She said everything looked good nothing came back abnormal. That was on the 18th. I know i have PMS and sometimes it does hurt, but these are different. The smell of Oranges make me want to puke, my nipples hurt so bad that even drying off with a towel they hurt, I can't hold my kid without pushing him away from my chest, my belly feels weird like right under the rib cage its somewhat hard, and I am two days late on my period. I have taken 3tests so far and each  one has said Negative, but for some reason, I feel pregnant, just as i felt when i had my first child. I take more naps than usual, and have lower back pain. These are all new symtoms, could i be pregnant and have a false negative, or should i still wait another week for my period? I know I was told to get a blood test to prove it. Problem, no health insurance. I have slight headaches but when i eat something, then it goes away for awhile Don't know. Also, can't remember when my last period was in late Dec, or early Jan. Please help.