My last period was on July 24,2007. It should have came around that time the next month and still no sign. I took a cheap test from the dollar store a week after I missed my period and it said negative. I waited another and took another one and it said the same thing. What is really going on? I'm now almost 3 weeks late and my brest hurt so bad I can't sleep on them. I can't stay awake at work because I'm so tired. my appetite has changed dramaticly and I started getting head aches off and on. I've felt nausus and weak but no throwing up. I go to the bathroom like crazy now. I feel like I have to go really bad and then only a little comes out. Can I be pregnant and its just not showing up in the tests. Help cause I don't know whats happening. I have 2 kids already and this only happened when I was pregnant. There's no stress and I'm not worried about being pregnant so it's not that. Can anyone help me please?????