The third week

In the third week, the blastocyte has chosen its way to the fallopian tube. This trip takes 3 to 7 days. As long as the journey continues, the cells continue to work, ready to implant into the lining of the uterus that has been built over the past week. Once the blastocyst has entered the uterus and attached (positive pregnancy test a few days after implantation), it sends signals to announce its presence. There is still no sign of pregnancy.