James is right. In addition, many of the antibiotics in use have been tested on pregnant bunnies, mice, or rats as part of the process by which they're approved by the FDA to be safe for use. The vet will know which ones are safe for pregnant does and don't cause birth defects. It's important to get her treated, because upper respiratory infections often don't show many visible signs until they've progressed pretty far.
It is possible, since Monday is the 15th, that the vet will want to wait until she's delivered the kits to start an antibiotic. However, she'll be breastfeeding them for several weeks after that in any case, so the only reason to wait, I would think, is if the best antibiotic for the situation, as determined by your vet's culture of the bacteria, is damaging to the fetus. If the drug is secreted in breast milk, the vet may want to know if you can foster the babies to another doe--do you have one ready to take that place? It may be easiest for this doe to have her babies, foster them onto another lactating doe, and not have to go through the physical stress of breastfeeding while she's sick.
