What Causes Vaginal Spotting Along With Stomach And Chest Pain?

I missed my period last month I normally get it every 27 th of the month it didn t come on. OK this month I was spotting like on the 3rd and den it stop a few hours after that I started bleeding stayed on for about a week now im having pain in my stomach and chest pains and headaches, and I be having cravings. can you answer this for me and tell me what might be going on.