No, that is not true. Pregnancy tests detect the presence of HCG, a hormone only produced in pregnancy.
can depo-provera be given before three months after the first injection
You get an injection every 11 weeks to 14 weeks
I was on depo provera for 11 years. I recently got off of it but during that 11 years I was irresponsible with taking my shots on time and I would take a pregancy test in between shots if i thought maybe i might be pregnant and it was ALWAYS negative. I never got pregnant so using a pregancy test during depo usage is not a waste. My sister in law got pregnant in between taking shots (the result of my adorable nephew) so its definitely possible to get preggers and i think its a good idea to take one if you are feeling uncertain!!