Glucophange which is Metformin isn't actually licensed for use during pregnancy it actually carried a contridiction in pregnancy...
My local hospital don't like there T2's on Metfromin if they are trying to have a baby, preferring them to swap over to insulin...
In 1991 I was given Metformin (long story to this) and when I found myself pregnant I was advised to have a medical termination , due to the possible trashing to the babies heart that Metformin can do.. I refused put straight onto insulin and had an healthy baby at the end..