Hi Tracey, welcome to the forum!
You are on a starting dose of Sandrena and it was correct for the GP to do this. Normally you'd have a review after three months and increase as necessary. However, it is usual to start low and slow.
It's worth noting that not everyone absorbs transdermal products in the same way, and some find a patch more effective than the gels. However, as you have only just started, it will be worth increasing the Sandrena to 1mg after 3 months and see how you go.
JP x