Pregnancy

Hey, so ive been on the depo shot for four years and I had sex with my boyfriend about 4 weeks ago and now and im having weird feelings. First, I was having these weird dizzy spells til they went away and I thought it was over. Now my back is beinning to kill me, im sleepin more (well thats normal for me) bt I have been having headachs and sometime my stomach feel like its turning up side down and not least then a week I had strated spotting bt at frist it started heavy.
...i just want to know if I could possibly be pregnant? Tweet