I think Im starting to get fat

For a few months now I have been going to the gym, I've noticed I havent beenbmaking as much gains as I should so I started trying to bulk, at first I thought nothing was happening but today I noticed something

Putting on my shirt my belly is significantly bigger than it was a few months ago(I'll send a photo if you want) I dont know how to feel about this, I have been wanting to try weight gain for a bit but never wanted to start getting fat