My Gf (18F) found an old model I (19M) used to consume when I was single. How do I damage control?

I(19M) used to have a porn addiction, and my relationship to the material is still unhealthy, she(18F) does not know about this habbit but I feel it will come up soon. This is both of our first real relationship and our first argument to boot. She called it put right before she went to sleep and ive already apologized profusely and provided solutions. Shes yet to respond and ive been unable to sleep worrying about what could possibly happen when she wakes up. I know this is my fault, even if this was from a long time ago I should've been aware how this would make her feel and unfollowed her or just quit porn in general. This is my first ever real problem with the relationship so far and weve both been very happy up to this point and just celebrated 6 months together. I know thats not very long at all but I was just hoping I could get some advice. Thank you all