pregnant or short period?

khaelyn • proud fiancé & mother to our three kidos ; one boy and two girls🔐
i just had my second baby back in october , and never got back on birth control so my periods were sometimes missed and once it was a week nd 2 days .. so this menstral came along and only lasted 2 days not enough to fill a tampon or pad , and stopped with brown not discharge but liquidy substance .. so im wondering what do you guys think i should consider doing?