Pregnant on depo?

Kierra

Before getting married I had never really tired any birth control. I just had a baby 3 months ago and took a depo shot to avoid getting pregnant again. I’m extremely concerned at this point as i am having all the symptoms of my early pregnancy: nausea, dizziness, headaches, high sense of smells and drastic mood swings. What are the odds ? Or could it just side effects of the shot?