2:1:1 dosing can be used by anyone having insertive sex or receptive anal sex.
If you might have sex on Thursday take a double dose at least two hours before you have sex.
Then take a single pill for the next two days. This should be roughly 24 hours and 48 hours after the first double dose.
These times can be approximate. You still get good protection even if you have sex earlier or later than planned. Even if the pre-dose is only just before or even after sex, some PrEP is always better than none.
If you have sex several times over a few days, keep taking a pill each day. Continue for two days after the last day that you have sex.