Tmi but help!

My CM never changes! Ever. 1-2 days after my period my CM returns and it is creamy until the I start my period. It never dries up, it never changes to egg white. Sometimes it's kinda watery but still creamy(white-ish)..there is no smell or color I don't itch and I've been tested multiple times to make sure it's not anything and im in the clear so what's going on???? I have been off depo and TTC for 21 months but no baby..Does anyone else go through this?? Is it a sign of infertility??