Depo shot

Has anyone been on the depo shot and got pregnant on it? If so we're your symtoms.any different from other pregnancies and did you get a positive right away or how far along were you when you found out? This is first shot I got in may so it's almost been 2 months on, I had one period and was supposed to start July 4th, and still nothing. Have all the symtoms of being pregnant but keep getting negatives. Currently 12 days late