Think about stopping the pill or changing to a progesterone only pill. Or use other methods. If the baby truly seems not to be getting enough, get help, but do not introduce a bottle that may only make things worse. If absolutely necessary, the baby can be supplemented, using a lactation aid that will not interfere with breastfeeding. However, lots can be done before giving supplements.
Physicians know a lot about breastfeeding.
Obviously, there are exceptions. However, very few physicians trained in North America or Western Europe learned anything at all about breastfeeding in medical school. Even fewer learned about the practical aspects of helping mothers start breastfeeding and helping them maintain breastfeeding. After medical school, most of the information physicians get regarding infant feeding comes from formula company representatives or advertisements. Pediatricians, at least, know a lot about breastfeeding.