I masterbated and ejaculated on tissue paper in a closed room and wrap the tissue paper properly while wrapping a very small amount of sperm comes on my fingers and then for throwing  that tissue paper I open the room door with same hand containg very small amount of sperm on it then after 5 min my sister comes in room and for opening the door she touch on same area where is very small amount of sperm almost sperm gets dry . Can she became pregnant by this act?? Please help??