AM I PREG??????????

ANy info is greatly thanked. Here is the deal. I am late for my cycle by 2 or 3 days. I have taken 3 test in the last 2 days, one faint line, and the other two where-. My question is what in the world is going on?? I always have CD lasting 29-31days, today is CD33. My boobs are sore, and I have a little cramping and tearing in my lower abdomen, I have 2 children one is 8 and the other is 3. My husband and I have been trying for a few months, with no success, and I have not been on anything for 3 years, just know when its okay and when its not. Only the lasy few months we have been not watching that time. Any help will be thanked again.