If you have some early pregancy tests give it a go. but i wouldnt be discouraged if it is a BFN as like you said AF isnt due just yet.

I bought a heap of cheapies with #1 so i could test every day leading up to AF - and got my BFP 9 DPO.

With #2 i got a lot of BFNs this early and finally got a BFP with a clear blue digital (which isnt sensitive) a few days later.