Asymmetric breast density. could i be pregnant?

Not sure. Do HPT.: Early pregnancy sxs can include: lack of period, breast swelling ; tenderness with darkened areolas, fatigue, increased urination frequency, constipation, bloating, heartburn, backache, cramping, headache, food cravings or aversions, increased sense of smell, enlarged waist, feeling faint/dizzy, mood swings, increased gas, insomnia, gagging more easily ; yawning.