Wierd cramps !

Laura • Hey I`m laura 19 recently had my baby boy :) been with my fiancé a short time and love him millions !
6DPO and I've been experiencing bad cramping across my stomach and pelvis :S . I have a creamy white CM . Wouldn't say I have many symptoms apart from tiredness , nausea , backache and real bad headaches :/ what could it be ?