I'd also say to move down to small rats, one every 7 days. Give the snake a couple of weeks then offer a nice small rat on the same day each week and see how it goes. Mediums are a pretty big meal for any BP. We don't even feed those to our full mature females. They get a small or occasionally 2 smalls once per week. Smaller meals once weekly tend to encourage consistent feeders. If you get a refusal just offer again one week later on the usual feeding day until the snake decides that it's time to eat again. As always of course, check that your husbandry is really bang on and confirm that your snake is healthy so you can rule those issues out. It's been said a number of times around here by very experienced breeders that refusing to eat isn't the problem, it's an indication of a problem likely related to husbandry, feeding routines or health.