Answer: Sore, tender, heavy breasts or darker areolas are noticeable pregnancy symptoms a week before missed period. With rising oestrogen levels after conception, women feel sore, full and experience acute pain in the breasts. Nipples begin to look darker and feel itchy, tingly or prickly Headaches are the most common pre-menstrual symptoms, however with conception, oestrogen and progesterone hormones work overtime to prepare the uterus for the baby. The hormones cause a dip in blood sugar levels causing headaches as the brain cells struggle to keep pace with low levels of sugar supply. Along with above mentioned symptoms u might experience vomiting, dizziness , mood swing.