Question about implantation(sp?) spotting

[ty&jessie]

Ok, so I have two children and have had one miscarrage, all of which have been concieved with a little help in one form or another...so we have never used birth control, we have just (sorry for TMI ) pulled out. well we got caught in a moment and didn't, I had my first AF since DD birth (a few days shy of a whole year) on the 20th od Dec. and DTD on the 31st...well yesterday I had a little spotting. Is this about the right timing for implantation? Could it be spotting from that? I am SO freaking out about this. (good and bad thoughts!) I have never had any spotting with any of my pregnancies except the one I lost, but that was at almost 10weeks. Any thoughts? When is the soonest to test? EEEK!