ugh! I need help with an answer to this

I had a normal cycle after I had intercourse august 16....last month I had a weird period my periods last 3-4 days for the bleeding part....well the bleeding has not been lasting long 1 day and a half to 2 days for bleeding and only filling 2-3 tampons full...otherwise half the tampon has light blood to barely any and just some brown like its ended way early and then the 3-4 day I'm supposed to be bleeding still its just brown like its clearing itself out...and my period this month did the same thing except it started with a big clot and lots of clear discharge with it...I know its tmi but its kinda a what's going on with my periods moment and could I be pregnant still with these types of messed up cycles? Also my period came 3 to 5 days later than clue said