Possible pregnancy?

Patient: Hi there, i had sex about 3 weeks ago, however i am on birth control pill but i missed one day. He used a condom, however after he had came, he rested for a minute then started again and i think he came again. When he pulled out the condom didnt appear to leak. I had my week where i come off the pill and i had a three day period. It seemed normal for me, dark red and heavy, the way it normally is. However i got my period the thursday and started a new packet of pills on the sunday.I am very worried to scared to go to a shop and buy a pregnancy test. Are the chances i am pregnant very high? Is a three day period normal?

Doctor: