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 emergency services for breathing difficulty, collapse, seizure, severe confusion, or inability to wake the person.
And for anyone, someone who:
Seek urgent medical care if symptoms are worsening, the person cannot stay hydrated, urine output drops, or significant abdominal pain develops.
For routine follow-up, monitor symptoms for the period recommended by Poison Control or the treating clinician.
Keep track of vomiting, diarrhea, fluid intake, urination, and any new symptoms.
Follow-up may also be appropriate if the product is used regularly and appears to cause symptoms each time.
The article also says
Contact a healthcare professional if digestive symptoms continue, green urine or stool does not clear after the product has been stopped, or irritation from a skin or eye exposure persists.
Before using the product again, review the full ingredient list with a pharmacist or clinician.
Discuss all medicines and supplements being taken.
If the container is missing, damaged, expired, or has an unclear label, avoiding further use is reasonable until the product can be identified.
Store concentrated liquids, powders, tablets, and gummies in their original child-resistant packaging.
Keep them locked away from children and pets rather than on a kitchen counter or in a refrigerator door.
Every sign above is quoted from the sofidex article on Chlorophyll poisoning. If you are not sure, err upward — it is always reasonable to be checked.