hun if i was you id still go the doctors explain whats happened 3 days is a very long time and the smell is not going to be very nice and who knows how long it will last your doc may give you something just incase its better to be safe than sorry
all the best and please be careful next time u r wasted but sayin that we r all there practacly every weekend we've all done stupidity :)
I have left a tampon in on mistake, while wearing another one. I suggest you not to douche, for it is not good. If you have no aches or pains, don't worry about it. Just try to be careful next time. Oh the smell could just be blocked up blood. The vaginal will cleanse itself.