Never had it, but here are the symptoms according to a dvt website...
Symptoms of Deep Vein Thrombosis (DVT)
Approximately one-half of those with a DVT never have recognized symptoms.
When symptoms are present, the most common is leg pain and tenderness in the calf muscles, or one may observe swelling or a change in color of one leg to purple or blue. These signs and symptoms may appear suddenly or may steadily develop over a short time. If you observe these signs or symptoms, you should contact your doctor immediately.
Symptoms are quite different if the clot breaks loose and travels to the lungs, causing a pulmonary embolism (PE). The symptoms of PE include chest pain, shortness of breath, rapid pulse, or a cough. There may also be a feeling of apprehension, sweating, or fainting. Such symptoms are not specific to a PE, and can occur with pneumonia, heart attack, and other medical conditions.
These are always critical symptoms that demand immediate medical attention.