Hi,
Sounds like you're recently diagnosed, so I just wanted to advise you to include your diabetes team in your conversation and thought process. While you're initially getting used to what having diabetes means, people usually get put on fixed insulin doses. I was put on fixed doses and told to eat to match in the first few weeks/months since diagnosis. I either did, and so ate more carbs than I would originally have done, or I didn't and had low blood glucose (hypo) so had to have sugar to treat it. I understandably put on weight. I then found out about carbohydrate counting which personally makes so much sense and has made my life since (14 yrs since and counting!) so much easier.
There is no reason your diet should change just because of your diagnosis. You talk about eating more carbs now, why is this? Having said that, before you reduce the carbs in your diet talk to your diabetes team who might amend your insulin doses so you don't hypo. Hope that helps a little!
Edited to remove typo