CBEFM question

Sorry I have not been on in a while, life just gets in the way

I have been using CBEFM and it went from nothing to high fertility yesterday(Monday). We were both tired and did not last night, but we did on Saturday and Sunday.

This morning I was in a rush so I forgot to test, but I am going to assume that I am still fertile today. So if I tonight and tomorrow do you think I will be ok, or did I blow all chances by being tired last night?!