A single gap is just an event, and what decides whether it matters is the next choice rather than the one already made. Trouble starts when one absence gets read as evidence about who you are, because that story makes the second absence easy and the third automatic. The streak is not the point; the return is. Circumstances explain one missed session, and circumstances change.

If you missed something, go back at the very next opportunity rather than waiting for a clean Monday. Do a short version if that is all that is available. Spend no energy on the explanation and put it into the next session.