13 days post ovulation. creamy CM before af sign of pregnancy?

I read that creamy discharge is a sign of early pregnancy!?? I'm 13DPO my period should be due tomorrow or Thursday . I took a cheap pregnancie test and I got a BFN . What did your CM look like before your period or before you missed your period and then found out you were pregnant ? I've been feeling slight cramping in my tummy, I've had creamy discharge , and usually by now my boobs are swollen due to af arriving soon .