I haven't had my period in about a month now. My period hasn't been late for more than 3 days. Sometimes it would come early. Now I feel tired constantly , my stomach feels a little heavy to me (not always), I feel a little sick ( especially with certain foods) but I don't get sick. I have also had a little bit of abdominal pain. To me I feel pregnant. I have taken about 3 tests and they have said negative. Is it possible that I am pregnant but its not going through the tests? I'm getting a blood test done but I have read that that doesn't always help either . People have had negative ones and did an ultra sound months later. They found out they were pregnant. Is it possible I'm pregnant?