Sorry you are not getting the answer you exactly need. So, not to be another problem answer, but wait. The concrete freshly poured will be going through an exothermic reaction and giving off moisture. So wait the 5 days, it is not the end of the world, but waiting is worth it, in almost all cases. Rushing makings a crappy job that needs to be done twice.

I will not comment on how you are doing it, but there were plenty of engineers and chemists (and maybe even risk analysts) that put their thoughts into "5 days" rule. So just follow it and do the rest as best you can and hope for the best on your long term outcome.