Am i Pregnant

Am 6 DPO and im getting some really strange symptoms i dont know if its pregnancy or just stress as my mum has just passed away. Symptoms im currently getting are: constant Backache and painful legs. Nausea. headaches. Mood swings. Cant count how many times ive bitten my poor partners head off. Im constantly exhausted no matter how much sleep i get. Getting slight tummy cramps. I dont really want to do a pregnancy test until ive actually missed my period as scared of being disappointed again. Been ttc for just 2 years now. Have 1 daughter from a previous relationship. And have had an ectopic pregnancy and found out i have PCOS.