Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call your local emergency number or go to an emergency department if there is immediate danger, an overdose or serious injury has occurred, or you cannot keep yourself or someone else safe.
Seek prompt medical help if symptoms are rapidly worsening, you are becoming unable to eat or drink, washing has caused significant skin damage, or rituals prevent you from carrying out essential daily tasks.
Get urgent mental health support if you have thoughts of suicide, self-harm, or harming someone and are worried you may act on them.
Unwanted intrusive harm thoughts are common in OCD and do not by themselves mean you are dangerous.
The urgent concern is intent, a plan, loss of control, or an inability to stay safe.
Arrange a routine appointment if unwanted thoughts or repeated behaviours are causing distress, taking up significant time, or affecting sleep, work, school, relationships, or physical health.
It is also reasonable to seek help if you are unsure whether your experiences are OCD.
Every sign above is quoted from the sofidex article on Obsessive-compulsive disorder. If you are not sure, err upward — it is always reasonable to be checked.