coud i b?

well my last normal period was january 19th, i had unprotected sex january 25, and february 4th. On february 8th i had a quik 2 day bleeding that was kinda pinkish not red and now again i am having it and its off color again kinda tanish pink…i have swollen, tingly breasts, frequent urination, cramping, headaches, diziness, fatigue, my breasts and nippples "seem" a little bigger 2. I took a test around february 19 but it was negative, but i still think im pregnant..could i b…what do u think and what ahould i do?