Was offered an interview and not heard back?

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I was offered an interview on Tuesday for next Monday and they said they'd get back in touch with a time. I haven't heard back from them since (I did respond when they offered the interview and they acknowledged that and said they'd get back to me ASAP now that is confirmed). Do I email/call them or what? I don't know what the etiquette is in this circumstance?

Bit too late now OP - phone on Monday to confirm and try not to worry about it over the weekend. I'd call rather than email (on Monday)

I thought of that @ohgenome but do you think that they're unlikely to say come in today (Monday)?

Depends where you are and the job but I'd say unlikely to ask you at such short notice and if they do then it gives you a measure of firm - if they are being unreasonable now then it may not be a good sign. If it makes you feel better (and to show you have engaged) drop them an email to ask for clarity but leave it open - the ball is in their court. Good luck