Hello, I am hoping for some feedback from other users as to what I might expect from this event moving forward. A few days ago I was departing an airfield under an IFR flight plan after the tower was closed (Thus Class G airspace). I was given a DP to fly however totally forgot to fly it (honest mistake) and was advised from ATC about a possible pilot deviation and given a # to call upon landing. The DP called for a climbing right turn after take off, I did the same thing except instead of immediately turning right on take off I waited to gain some altitude first (about 700ft) before turning right, in which the tracon noticed, asked if I was familiar with the DP and I advised I was not (Whoops, I was supposed to be flying it). The field was VFR and VMC conditions existed everywhere in the area and along my entire route. I was simply going IFR for the practice as I recently received my instrument rating about 3 months ago. My mistake did not cause any traffic alerts, loss of separation or terrain alerts...etc other than not doing as I was expected. It was a rather quiet night in the sky. I spoke to the tracon after landing, controller was nice, asked me why I didn't fly the DP after I accepted & acknowledged it with clearance delivery and how I should of asked for no DP ahead of time if I was not able to comply...etc. I was polite, apologized and advised I reviewed the DP and would not make the mistake again. Tracon said they would put it in their logs but not sure if anything further would happen and kinda left it open ended. I completed a NASA report within 24hrs and felt like I learned a lesson and won't repeat it again. In your opinion, what is the likelihood that I am violated and get a call from the FSDO in the upcoming days? And if I am contacted, should I consult with an aviation lawyer first? Naturally my fear is a 709 ride or a suspension...etc. I've been beating myself up all day thinking about the unknowns.