I had a lightperiod which started early. It was 4-5 days long, ant its ALWAYS 7. It started brown, the turned red, then brown again.

Afterwards, I started to experience light cramping in my right abdomen, nasuea, headaches, mood swings, constipation, breat tenderness, etc.

I took one test and it came out negative.

Could I still be pregnant?

Do you want to clarify "still pregnant"? Have you recently had a miscarriage or abortion? If so, how recently?

No, I have never been pregnant before. I read up on it and I have all the symptoms, but the test (equate +/-) came out -. My husband and I have been trying since November, but I also Have Diabetes Type two, which makes it hard to become pregnant. I'm on Metformin.

You can wait a bit longer and test again, or go to the doctor and get a blood test.