Hi. I imagine you will have to ask the agency some questions. Perhaps their embryos are stored at their facility, 2.5 hours away. This would imply that you would do the transfer there and probably stay there for a few days to rest. It does not seem reasonable for you to travel for regular doctor's visits. It seems like you would be able to see a doctor closer to home for most things. After all, you have your own family.
In any case, I would ask the agency what matching with this family would entail and then decide from there if you are willing to travel. Also, you would want to meet the IP's to see if they are a good fit for you.
I hope this helps