my fingers and feet are swollen?

Hi,
Welcome to ehealthforum,
The lighter and early periods could have been suggestive of probable implantation bleeding (if the unprotected sexual intercourse was during your fertile days). Few women can start experiencing pregnancy symptoms early (it depends on how your body responds to the changing hormonal status). The symptoms (increased tiredness, dizziness, nausea, headaches, emotional/mood changes, swollen breasts, frequent urination, abdominal discomfort, morning sickness, peripheral edema) that you describe could be suggestive of possibility of pregnancy. Wait and watch for your next periods. Look out for development of any new symptoms if pregnancy is suspected. If you do not get your periods within 10 days of expected period dates, or if you develop any new symptoms, or if you get abnormal periods, you should consider visiting your doctor/gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest.
Take care.