When should I test?

(A little long sorry.) Okay so I had what I thought was implantation bleeding three days before I got my period, and when I got my period I thought I was out. got sad and moved on. but it's a weird one and I'm having a lot of pregnancy symptoms like severe fatigue and heightened sense smell and occasional nausea amongst a few other things. I know that since I got my period it's not likely that I'm pregnant, probably just a bad visit from AF, but I've never had this before and I know the HCG hormoan doesn't produce until implantation so it's possiable the hoarmoans were just not strong enough.