Your stem cells are expected to grow (engraft) and begin to produce blood cells two to three weeks following your transplant. During engraftment, you may notice aching in your bones, especially in your pelvis, lower back, and thighs. Your white blood cells are the first to engraft followed by platelets, and then red blood cells. Autologous patients usually engraft all three blood cell lines within 6 weeks post-transplant. Allogeneic transplant patients may have delayed engraftment of platelets and red blood cells for several months. This means you may continue to receive platelet and blood transfusions even when you are discharged from the hospital.