The lack of period is fine but the missed pill could still be a worry, what specific pill are you on? Some combined pills have a 12 hour window and some a 24 hour window. If you have a 12 hour window then it was definitely a missed pill, if it’s a 24 hour window then I’d still be careful.
You had unprotected sex a couple before the missed pill right? I think that’s unlikely to get you pregnant, but I’d suggest using additional protection until you’ve taken 8 pills at your usual time.