Found a condom wrapper in the trash and someone knocking on your door?

Just this past week I was over my boyfriend and me and his dog was playing when he knocked over the trash can in his room low and behold I find a condom wrapper...We talked and he said he found it under the bed I remember him saying where is the wrapper after we got through but I put it behind me...Later on that night we are relaxing and some one knocks on his door and he goes out and comes back like someone was playing on the door...We talked it over but I'm still apprehensive about the situation UGH!!!!!!!!!!!!!!!