It depends on how much you touched yourself: How long and how intensely. Also, will you go looking for those images again?
It depends on your goals. However searching for triggers is a dangerous business, as it will creep up on you until full relapse occurs. Regardless of whether you orgasmed or not, searching for triggers is reinforcing the urges to engage in this sort of activity. It does say in your counter you will reset if you edge at all, however I recommend splitting up your counters (P and M), so you have more reference as to where you're at in your reset. I wouldn't say looking at triggering images demands a reset, however it is certainly not a good road to be on. My latest relapses have been due to carelessness in preventing myself in searching for triggers, and being irresponsible about how often I was Ming. Cheers PS- 12 days is great, keep it up (regardless of whether you decide to reset or not)