Very curious about my cycle lol

Okay so my period came on tha 1st after missing it all last month but it's not heavy at all this month it's brown but wen it first started it was pink & red not heavy wats so ever i uses tha rest room it's not blood in my pee or in tha toilent like it used to be.... it's brown now wen i whipe it's nothing even there it's so light it's tha color as if it's finna go off idk i do believe my period are irregular but on a average it's 28 days sooooo idk ik I'm not pregnant because my bf tried that on purpose & it din work i jus wanna know what's making my cycle do this like it's dots of brown blood & It's only my third day on no cramps no of nothing maybe tha food i eat or i need to do exercises more idk but this is unlike it