I had unprotected sex a week before my period was due. I was two days late and it lasted three days. I have very normal periods and have never done this or been late. I was two days late when I found out I was pregnant with my daughter and didn’t get my period but this time I had negative pee test. I have some symptoms also. Nauseous, sore/tender breast, headaches, tired. Would blood test be better for me to try? Would it be able to tell me if I’m pregnant this soon? Something just doesn’t feel right to me..