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 immediately for:
And for anyone, someone who:
Seek urgent medical advice if symptoms are worsening, vomiting prevents fluids from staying down, urination becomes noticeably reduced, or unusual drowsiness or confusion develops.
Arrange routine medical follow-up if vomiting, diarrhea, rash, reduced appetite, weakness, or irritation continues.
People treated for a significant exposure may need repeat blood tests to confirm that kidney function, electrolytes, and hydration have returned to normal.
Follow-up is particularly important after hospitalization or if kidney injury occurred.
The article also says
Follow the instructions given by Poison Control or the treating clinician.
After a minor exposure without symptoms, home observation may be all that is needed.
Do not repeat the exposure, and store or dispose of the product according to its label.
To prevent another exposure, keep boric acid in its original labeled container.
Store insecticides away from food and medicines.
Keep vaginal products separate from oral capsules, and never transfer boric acid powder into cups, jars, or food containers.
Every sign above is quoted from the sofidex article on Boric acid poisoning. If you are not sure, err upward — it is always reasonable to be checked.