Too soon for social media?

I signed up for certification starting in November! I’m super excited and already setting up my office area, planning changes in my current career etc. I set up an Instagram page for my coaching business just to get it going and as a way to start really living into my future self. I’m having doubts about 2 things. One is that I am not a coach yet, so is it even ok to start presenting myself as one? I’m not planning to use any specific Life Coach School teachings until I am certified. I mostly want to get in the habit of posting and putting myself out there, introducing myself etc. Also, I am getting married in July and will have my coaching practice using my new last name so that’s what’s on my business Instagram, but I’m feeling like an imposter due to thoughts about that not even being my name yet!