Cervical mucus?? Please help

Becky • ttc
I have been getting A LOT of white, creamy cm since ovulation. It's has been increasing in quantity as I get closer to AF. I am currently 13DPO (AF tomorrow) an had lots of creamy cv today. Took a pg test this morning but it was negative. Does this cm mean anything or am I just being too hopeful ? Has anyone else had creamy cm before they found out they was pregnant? I have no other symptoms as of yet. Any advice greatly appreciated.