depo question

Schree • Paislee Mae Bryce💜 Kason Dale Bryce💙 Blakely Marie Dunavant💖
So I got one shot of depo in June the shot ended in sept and October I got my period right on time and November I got my period on time but this month AF hasn't showed up me and the fiancé have been trying but I'm wondering maybe if it was the shot still messing with me or if I could be pregnant..I've tested twice and both were negative..I'm so confused..