Early Pregnancy Warning Signs - A period has been skipped. A missed period is often the first sign that a woman has entered the early stages of pregnancy for most women. … - Urination on a regular basis. - Breasts that are swollen or tender. - Fatigue. … - Nausea, which may or may not be accompanied by vomiting… - Light spotting and cramping. … - Bloating. … - Mood swings are a common occurrence.