This might sound like a silly question but im genuinely confused. We were together just once around mid cycle and now im worried. Is it really possible from a single time?
Yes it can happen with one time, no doubt. If you want to plan or avoid, best to talk to a gynac about cycle and contraception properly rather than guessing.
I had this same doubt when we started trying. Read that it really depends on your fertile window, around mid cycle chances are highest. One time during that can work.