My daughter started her OCD
with stress from her school study, then she began
with washing
rituals, strict checking, and gradually turned into saying and repeating same kind of conversation, words everytime she wish to release her stress and anxiety.
Whenever she needed to do anything (like changing clothes, brushing her teeth, putting her shoes), she needed to force herself to keep on coughing for at least half an hour (not due to sickness) before she can starts.