PTSD is a specific diagnosis of a cluster of symptoms (avoidance, hyperarousal, intrusive thoughts/feelings, etc) that occur in relation to a traumatic event. Not all traumas result in PTSD and having PTSD itself is not an indicator of a particular type of trauma. It is not uncommon for there to be a delayed onset of PTSD symptoms, sometimes years after an event.
Whilst trauma-focused CBT and EMDR are specifically recommended for PTSD, you do not have to have a diagnosis of PTSD to benefit from these treatments. You may have some or all of the symptoms of PTSD, and your Psychologist will want to tailor any treatment to your specific presentation.