Period 4 days late need help

Period 4days been feeling mixed feelings abt if its gone come on or not. My boyfriend been feeling like I am. Idk though we have 3 already so ik he would have a clue if I was. I been sleeping alot n so has he. I been having like mild back pain n sum crampy like feelings ever since 2 days before it was pose to start. I got my nipple pierced in july n its been ok healed well n all n ever since the period was pose to start its been irritating me n if pressed colustrum n brown colustrum comes out. Even though my youngest is 2 idk what's going on can someone help..