Need some opinions on implantation?

ok so here goes...just recently got married and we are trying to have a baby...we had a MC in September 2008 and weve been trying since November but didnt get much time too. since we got married, we moved in with each other and gotten alot more time together...the MC hit us both hard and we want a baby. i havent thought i was pregnant after the MC up until now. i started my last period on January 14 and im supposed to start today and nothing yet...last monday when i went to the bathroom when i wiped i noticed a very small brown spot very light. i put on a pad thinking maybe i was starting and when i BD'd every other day after my January period. now im feeling hungry all the time and im having the same "morning sickness" at night that i had when i was pregnant the first time. i cant sleep at night just like when i was pregnant before and i havent started...i dont want to take a test just yet because i cant take another BFN...what do u think of this situation? do u think i experienced implantation bleeding? do u think that all these things will lead to a BFP?...when should i test??? thanks in advance for everything...good luck and lots of baby dust and prayers out to all the women TTC