Pregnant on depo shot???

Julia
I been on depo shot for a long time just got my next shot 2 days ago and Wednesday's had sex stayed in and today's had sex and. Stayed in for a second and Pulled out , could I get pregnant??  My pregnant app it says 27% could get pregnant and  doing it on fertile days , but I don't know if the app is right saying I'm fertile.... How do I find that out 
I asked because I had a physic free reading and the lady said with in 3 months see my being pregnant..... I already have 2 kids 5 year old and 2 years old.... 

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