Is There Still A Chance...??

I was wondering...Can you have negative blood test and negative HPT's and still be pregnant? I know it is unlikely but I swear I feel very pregnant. My MP for the month of May didn't show and around the 4th of June I had some light spotting which is unusual for me and it only last 3 days. I havent had a regular MP since March 28th, which was 5-6 days long and with heavy, to medium, to light flow. April my MP was very light also but showed on time. I've had a few pregnancy symptoms such as nausea, headaches, (terrible) lower back pains, appetite change, etc. I'm really not worried or anything but I just want to know if it's possible. Now below my belly button feels a little ferm and it usually doesn't feel like this. Advice and comments are a must to me right now!