Confused? Super TMI!!!!!!

I've had spotting for the past 2 days on and off. And had spotting on the 18th of this month as well. Its light pink and bright red with very few dark clots. Lower back pain and nausea. My breasts have been painfully sore. My period is SUPER late and have had negative pregnancy tests. Starting today had twinges and the feeling of a needle stabbing my left ovary. Has anyone every had this happen? Could anyone help shed some light as to what is happening?