I started the depo on December 4th and had my period December 3rd and had sex on the 6th and 7th and now today the 9th I feel extremely sick I've been throwing up in my mouth all day and I'm having lower abdomen pains. I know it's early but why is this happening. I have never taken the shot before and my shot didn't have extra hormones like the regular shots do. What should I do.