Ever since i started getting my periods they have been crazy. I dont get moody or anything just really tired and they are normally a little on the heavier side of flow no cramping or anything though. Even on birth control they were weird i could go 2-3 months without a period and then have one for 3 days and be good until the next month where it would go for almost 2 weeks. Doctors tried checking things out and nothing was wrong. I then had 2 miscarriages and i have been pretty regular ever since until now lol. i was supposed to start my period on the 28th of august and still nothing, i get moody fast, constantly tired and running to the bathroom and my stomach is starting to get firm. Anyway what im trying to say is anything can cause a period to be irregular and i know you can bleed during implantation but its only supposed to be light spotting. I suggest getting a pregnancy test and trying that or going to the doc and talking to them about it.