Depo Symptoms

I have been on depo for a little over a year. My last shot i got 2 days before my 13 week window was up, so I assume i was still protected. I’ve been having really sore boobs and a little nausea here and there, as well as cramps. I took a test with FMU about 2 weeks after I last had sex. Should I be worried about pregnancy or is that test pretty accurate? If anyone had experienced this on the shot please let me know