So irritated! Why AF why!

Day 6 when my period are usually 4 days. Started Sunday and had normal medium flow till Tuesday when I started getting super light and than stopped Wednesday had sex no problem 4 hrs later started spotting and cramping again and here I am 2 more days of spotting am cramping and it’s like so little barely worth a panty liner but still spotting enough where I left one dot on our nice white sheets 😭 I don’t think I am spotting today but these damn cramps! Why oh why AF do you have to change things up on me plus making beyond nauseous anyone deal with periods out of wack like this?