Can you have symptoms pregnancy before having a missed period?

Yes: The most common symptom is "nausea", .

Yes.: There has to be a certain level of hcg, the pregnancy hormone, in the blood to keep the period from recurring.

See below: Other symptoms might include breast tenderness, nausea, and fatigue.

Sxs: Possible early pregnancy sxs: no period, breast swelling & tenderness w darkened areolas, thin, white & milky vaginal discharge, fatigue, ^ urination frequency, constipation, bloating, heartburn, backache, cramping, headache, food cravings or aversions, ^ sense of smell, enlarged waist, feeling faint/dizzy, mood swings,^ gas, insomnia, gagging & yawning. They may begin after missed period.