Early pregnancy symptoms?

Victoria • Baby #1 born 6th August 2016 at 37w 4d 💕
So I had my impala on taken out about 5/6 weeks ago and I had very slight amount of spotting at the end of last month for approx 1/2 days. 
Lately however I've been feeling nauseous, off my food, peeing more regularly and today I had the metallic taste in my mouth but having a negative pregnancy test. Not sure if it's post implant effects or I'm pregnant... Help!? Ps; been having unprotected sex every day!