Free bra fitting?

Melanie
Ok so I know departments stores, Victoria's Secret and Soma offer free bra fittings but they are hoping to sell you a bra. They don't carry my size. Right now I wear a 38H from Lane Bryant and was measured as a 34H which they didn't carry. This morning my bra was too tight (don't hate me). Does anyone know where I can get a fitting that doesn't involve them trying to sell me a bra? I'm afraid they'll measure me wrong since they don't have my size. Can the OBGYN do it?