Everyone develops differently and it takes years for breasts to develop

7 months in is way too early to tell but it sounds like you're developing as per usual... But yes, check with your Dr.
After nearly two years of HRT my breasts have gone through a variety of changes from the big nipple cones to finally beginning to look like a normal pair of girls and they are still developing
It really is a luck of the draw kinda deal to be honest

Look at cis girls, some get mosquito bites, others get back breaking bombs, but the most common size is 34B