It is very difficult to say about the cm. Some women report lots and lots of creamy cm and get a BFP, but it is also a sign of impending menstruation. If you are past due and getting lots of creamy cm that may be a good indication.
Its very hard as far as discharge is concerned,some say you get increase during pregnancy,but you also get it day or 2 before af wet and creamy could be a sign of impending af,but only a test will tell.good luck..