Hello. This is my first time experiencing this changes. I am 20 years old, sexual,y active, and I ve been on the monthly shot for 9 months now. However this month I got my shot 4 days late. I was supposed to get my period 3 days ago but instead I am having a brown diacharge, headaches, hotflashes and fatingue. Can you please tell me if there is a possibility of pregnancy? I have not taken any tests yet.