Weird bleeding

rainlover • just turned 21 last October and really trying to make myself healthy and getting ready to get pregnant. I have pcos and in may it will be two years off birth control so hopefully I get there soon
I had kinda a off period last week it lasted the full week n ended last Thursday but now I am bleeding old blood n its not just a little spotting and my period was for sure done with four days ago. Does anyone know what could be going on I'm also feeling sick like I'm going to puke n dizzy n having bad cramps