I took two pregnancy tests. Both In the evening time. One before my missed period one four days later They came up positive but the positive line quickly disappeared.. We are trying to conceive and had intercourse the time of ovulation the day after I was supposed to start my period I had a light bleeding for a couple hours and no other bleeding which is what I'm thinking implantation. I am having signs of pregnancy. Very nauseated and tired having mood swings I'm confused on why the tests did this any suggestions?