i ve been using depo provera but quit using it for the past 5 months after my marriage ,i had unprotected sex with my husband 3 weeks back and i havent seen my period up to now and i have the following signs;tiredness,frequent headaches,feel like vomiting but not,feeling sleepy in the afternoon,frequent urination,drinking water time and again,painful breasts,tired of talking ,sensitive to smells,continuos heartburn could all these be signs of pregnancy