Hey all, first time posting here - hope you don’t mind!

I’m very new to all of this and I’m currently 11 DPO been feeling nauseous since 5DPO and had cramping for the last 3/4 which never happens for me pre AF. Had some hot flushes, gone to the loo more. Been very thirsty too and yesterday was absolutely ravenous - not sure if these are symptoms??
I’m very conscious that I’m symptom spotting and it’s all probably NOTHING!! I wasn’t expecting the nausea so soon so think it might be something else? Is it possible to be nauseous this early? Done an early test today and got a BFN but not sure if I’m too early? When is the earliest and mode reliable time to take a test?
Sorry if I sound super naïve - don’t know anyone who’s gone through it plus the internet has 100+ different opinions!!