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Your symptoms as heavy bleeding,sore breasts,mood changes can be due to hormonal changes in the body,pregnancy changes(some woman can have after a week of conception)if you had unprotected intercourse,anxiety,stress.If the bleeding is prolonged and quite heavy then you might require medications for controlling it.
Wait for few days and if the bleeding persists consider visiting a Gynaecologist for evaluation and appropriate medications for controlling bleeding.
Take care