Weird bleeding

rainlover • Off birth control since 5/2016 been actively trying since 9/2017 22 years old now.
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