Has my dog aborted her pups?

my dog was mated a month ago she is showing all the pregnant syntoms however other breeders are tellin me that the mate wasnt successfull because she is going on 5 weeks and her **** havent dropped and turn red as yet also her vulva got smaller is this also a sign that the tie wasnt succesfull she has appetite loss and seems lies down most of the day is she pregnant or not please help