Im 18 and I hv been on depo shot inconsistantly for almost a year now. My next shot is due soon.and I've been having unprotected sex.I feel nausea everyday,tired all the time,I feel like I hv no energy half the time,and certain foods make me nausea, I'm hungry a lot and I normally never eat..I'm a smoker and and occasionally drink. I feel as if everything is starting to bother me,and I hv been having these extremely emotional mood swings.I hv to got the bathroom a lot and I hv been having discharge recently,could I be pregnant???