Section 21

I have two tenants who started on a six month AST just less than six months ago. I realise that I have not given them a copy of the How to Rent leaflet or a copy EPC. I do not want to give them notice to leave, nor do I foresee the need to but, if I did, might this compromise my giving a section 21 notice? If so can I just provide them with those documents now?Otherwise do I need a new tenancy agreement?

Thanks