Help!!!!

I took a pregnancy test wenseday , and it came out positive! The second line came back so quick!!! Then the next day (Thursday) I took one blue clear test that came out negative! Then Friday I took another clear blue test and it came back negative again! What should I do? I also had sex Today and last week twice were my BF cummed in me every time. What are your suggestions? Also felt very sick last week and yesterday my breast were VERY sore!