My first shot of depo provera was on November 12, my last day of it was February 12th. Well, I started taking prenatal vitamins two weeks I think before it ran out, I'm on no contraception right now. I have had sex since I started taking prenatal and after my depo ran out, and the past two days I'm waking up so sick to my stomach, where I almost vomit. With taking the prenatal vitamins, could I be pregnant? If not what could possibly cause morning sickness?