Could my scanty period have been implantation?

In all my 20 years of having my period, I've NEVER had one as light as this one. Really and truly. It wasn't heavy from the beginning. I didn't even bother to use any pads the last couple of days of it because it was barely there. It started off as brown, watery discharge and then got heavier (not even enough to fill one pad over the course of the day) then got very VERY light. The only thing is that it was my regular five days. I do feel nauseous this morning and my boobs are sore even though it's now finished. Should I test anyway or just leave it as a scanty period?