4.5 weeks pregnant and confused..?

I went to planned parenthood yesterday and had a positive pregnancy test. By the date of my last period they saybim 4.5 weeks. this is my 3rd pregnancy. I have a 3 year old boy and had a misscarriage a year ago. I am very moody and craving everyyhing. Im also tired and gasy and pee alot. My breasts are soar and I am very sensitive to smell as well. Now I am totally against abortion but my bf thinks the abortion pill is a good idea. I dont think I could live with myself if I did. I am already expieriencing so many symtoms so fast and im not sure if I could be possibly farther along. Any advise would help...