I have been spotting for about 18 days. I get nauseous, light headed, I can smell everything. I just tried out the depo shot for the first time. Got it on November 1st of this year during my period. My period stop on November 3rd. The doctor did told me not to have unprotected sex for two week. My boyfriend and I had sex four days after getting the depo shot and he came inside on November 5th and 6th. I started spotting 5 days later after we had sex. I havent stop spotting since then, today is November 27. I've been have some pregnancy symptoms. I have read about implantation signs which I'm having. Am I pregnant and is it because of the depo shot ?