Please help

Hi so i had unprotected sex on the 4th day off my period which was the 7th we only did it for a minute or less he didnt ejaulate 4 days later on the 11th i got ellaone but on the 14th my fertile window opens (6days after the 7th) do u think theres a chance of me being pregnant and ive been told by the doctor at the pharmacy that in my situation it’s impossible but im still really scared