Help?

Sian
So I'm 17 DPO right now with no sign of AF whatsoever! I've been experiencing these symptoms:
​fatigued during the day
trouble getting to sleep at night
Nausea morning And late night 
Emotional
Back ache
Sore boobs
Runny nose
Metallic taste in mouth
Diarrhea (sorry >.<)
​I did a test a few days ago but got a BFN
​could these symptoms mean I am pregnant and Is it still too early to re test?  
​Thanks all xxx