Signs of pregnancy before a missed period include breast tenderness, fatigue, nausea and increased urination, according to Mayo Clinic. Other early symptoms of pregnancy include light bleeding, cramping, constipation, dizziness and mood swings.
Pregnancy causes an immediate change in hormones, which accounts for the presence of these early signs, details WebMD. The spotting that occurs before the next scheduled period may be a result of implantation. As the fertilized embryo buries itself in the lining of the uterus, light blood flow emerges as spotting. Bleeding that continues up to seven weeks is normal as well. A visit to the doctor and an ultrasound can determine whether there is a need for concern over the continued bleeding.