Hi,
Welcome to ehealthforum,
The symptoms that you describe could indicate possibility of implantation. Take adequate rest. Drink plenty of water. Maintain healthy diet. Avoid lifting any heavy weights and avoid heavy work. Avoid standing for long durations and avoid climbing stairs. Avoid use of caffeinated and carbonated beverages. Avoid intercourse until pregnancy is confirmed or until your gynecologist clears you to resume sexual activity. Wait and watch for your periods. Look out for development of any other new symptoms if pregnancy is suspected. If periods do not start within 10 days of expected period dates, or if you get abnormal periods, or if you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
Take care.