I have been on the shot for about 2 years on and off but my last depo was in March I never went back to get it but I got my period on Dec 27 but Ive been having sex all month and when I had sex on the 27 I started my period after that n was on for 5 days after that I been using MC ovulation so I been having sex since I been in my fertile period but I spotted on the 4 of Jan not long n I been having menstrual pain like Breast tenderness and nausea but no vomiting. I took a pregnancy test on Tuesday and it said negative did I take it to early but my next period ain't until Jan. 24 can somebody tell me what's going on???