Am I pregnant?

I got my period the 6th of this month. Nine days later,I conceived and the condom slipped off at the end. Most of the sperm seemed to be inside the condom. 3-4 days after conception my breast started to get swollen and I hat a slight uncomfortable pain in my right Fallopian tube.5-6 days after conception ,I started to get sharp pains in my uterus and feeling quesy. I've been extremely paranoid and getting small anxiety attacks whenever I start thinking about pregnancy and what would happen. I've been tired and feeling weak. Although I sleep a bit more. I'm not ready for a baby at age 17 and i dot want my boyfriend to quit his dreams to deal with me and a baby. I'd like one later but not now. Would you know any other reasons why this is happening? Could it just be in my head??