Symptoms of pregnancy may vary, as all women are not alike nor are pregnancies all alike. The most significant symptom is a missed menstrual cycle. Here are some common signs of pregnancy, but please be aware that there are other medical conditions that can cause these symptoms. Spotting Tender Breasts Fatigue/Tiredness Nausea/Morning Sickness Backaches Headaches Frequent Urination Darkening of Nipples Food Cravings or Food Aversions Dizziness