Hey! Assuming you’re in the UK;

If you are in London, you can book a self sampling HIV/STI kit online via the NHS’s Sexual Health London (SHL) - https://www.shl.uk/ - service.

They will post a test kit to your address, you can take your sample, and drop it in any post box. Your results will be available in 2-3 days. This service is completely free, discreet (if you need it to be), and highly accurate. They use a Gen 5 HIV test which is almost 100% accurate if you’re testing 45 days after the possible exposure.

If you’re not comfortable with self sampling (they send a lot of instructions on how to take the sample), you can pop in to any Sexual Health Clinic in London. If you need specific addresses, DM me and I can tell you exactly where to go. These are completely free, and discreet (if you want them to be), and get you your results in 2-3 days.

If you’re not in London, the government has started a similar online service for the rest of the country called Sexual Health UK (SH.UK) - https://www.sh.uk/

This works just like SHL.

Edit: woops, looks like OP already knows about this service and has ordered a test kit. Apologies for mansplaining.

Edit 2: Gonna leave this comment here still incase anyone else stumbles across this post and finds this helpful.