Temple street are great so you are probably right to stick with them especially through pregnancy.
I found the maternity hospital i atteneded (a big one in dublin 12) useless though no one knew anything about pku kept asking me what it was and if it would have any affect on pregnancy I was shoved from one dr to another for the 9 months and eventually sent back to orignal dr then when baby was born they made mess of her measurements immediately after she was born which caused me so much stress. Hopefully if I went back would be easier next time cos they have seen me before.
Hope all goes well for you keep us posted.
Nadege batwoman is correct you probably need more free or low protein foods and mroe calories lucozade is great for that. Hope your levels come down for you soon