Implantation?!

Yecenia
Well I've been off the pill since July and my boyfriend and I haven't been using any protection.. I miscarried in March 2015 and are TTC once again. I had 2 peruods in July and in august I got just one but it was very light and only lasted maybe 2 days. I thought maybe I was pregnant so I was taking a pregnancy test every other week and nothing! I just got my period yesterday and it's not normal at all.. It's very very light to where it doesn't even show up on my pad just when I wipe.. Earlier when I went to restroom there was practically nothing on the paper... I don't know what's going on! Please help!