2 negative tests...is this enough?

Hi guys,

I live in Australia.

Let me start by saying thanks for looking at my question, I hope you can shed some light on this.

I fingered a girl almost 3 months ago. (around 82 days ago) during this action I put my fingers in my mouth for no more than a second.

This event caused me great stress over the first few weeks. I have had no symptoms since this time.

I got a blood test at 55 days, and a blood test at 78 days. Both for HIV and both came back negative.

Do I need to retest at 90 days? Or are my results conclusive?

Thank you so much.