for the following three days I missed my pills!

Hi,
Welcome to ehealthforum,
Having intercourse after missing your birth control intake (for 2 or more days) can put you at risk for pregnancy. If you were during ovulation time during sexual contact, chances of pregnancy are possible. Wait and watch for your periods/withdrawal bleeding. Look out for development of any other new symptoms if pregnancy is suspected, and if you develop any new symptoms suggestive of pregnancy, or 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). 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. Maintain healthy diet and be regular with your birth control use.
Take care.