How many DPO can you do a pregnancy test?

Aimee
Hi guys,
I'm 6/7 DPO and every twinge in my body is driving me mad... And now this morning I am a little nauseous 😱 would it be silly to do a test now? This is only our first month TTC so I obviously realize I'm being SUPER optimistic 😂 
Any advice welcome, thanks ladies!