Period help

Hi all period was due today but on Sunday I started off having brownish like blood when I wiped it got a bit darker and heavier through Sunday night but come Monday was very light again nothing really on tue and only little brownish today wen wipe ? Before I had the bleed I experienced mild belly cramps I lower tummy ache I’m not normally early on my period , does it sound like early af as implantation bleeding is ment to be lighter just a really strange af if it is ?