Georgette, if you google fertility friend's website (most of us have a link on signature), and sign up for the free course, it describes the stages of CM changes in quite detail. Basically, after AF, you go from dry, to sticky, to creamy, then watery, then eggwhite consistency which stretches when you get very close to O (not everyone gets eggwhite, but watery is still considered fertile CM). After O, CM dries up again pretty quickly but you may still get patches of CM (not as much as during the first phase of your cycle).

Most important to remember is that watery or Eggwhite CM indicates you should get bedroom action happening as it's your most fertile time.

As for changes that might indicate pregnancy, Fertility Friend's recommendation is that there aren't really any particular CM signs that would strongly indicate pregnancy. But I've noticed some girls here commenting they get heaps of CM around BFP time, then weeks after BFP they might get greenish-coloured CM.

Best of luck !! Hope your late AF is indicative that you got it right early on !