Am I pregnant?

Hello, I joined this forum in hope that I could get an answer from some of you lovely ladies on this site. I'm unsure of whether I'm pregnant or not and I'm sort of shaking in my boots.
Me and my partner have only been together for about 3 months now. When we first started dating I was on birth control (The pill). But two months into the use of The Pill I had some severe breakthrough bleeding that lasted about 14 days and caused my lower abdomen some serious pain... I stopped taking birth control in hopes that it would stop the bleeding and it did! However... During that time I was off the pill we had unprotected sex alot. The time the breakthrough bleeding started was on the 7th of last month. I haven't had a period since, it is now the 13things of the following month and I have no signs of my period showing up at all. I had taken 3 pregnancy tests last week, on the 2nd, 4th, and 8th. They all came back negative. Was it too early to start testing? My symptoms include, nausea, slight lower abdominal cramps, sensitive nipples, headaches, extreme tiredness, and I've suddenly developed a strong craving for breakfast cereal. I'm not sure if I'm over thinking this, but what do you ladies think it could be? I am seeing a doctor about this soon and will hopefully find out what's wrong. :)

Certainly sound like pregnancy symptoms. Did you see the Dr?