Am I Really??

BirthControl Shot?

Ok So I Got My Shot September 24 At Planned Parenthood && I Was Due 12/24. When I Called After Christmas I Was Told That I Was On Time && The Next Time I Called I Was Late Another Receptionist Had Told Me. Because I Thought I Was On Time I Had Sex Tha 24th && Tha 31st Got My Period On Tha 4th Thats When I Realized It Was Out My System I Have Been On Depo Once Before To Know That It was Out Of Me. Anyways My Period Lasted Until Tha 6th The 6 is When I Recieved My Next Depo They Neva Tested Me For Pregnancy She Saiid I Was Still In My Window && Not Too Wrry About It. But now i am wrried because im having all Pregnancy Symptoms Sore Breast Nasuated Dizzyness Ect. Is It Possible For Me To Be Pregnant. i Took 2 Test Already Both Negative Maybe Its Too Early. I Have a Appointment Tamorrow With My Ob Gyn Should I Ask For A Ultrasound What Should I Du I Need Answers