Did I understand it correctly? Did I say it correctly? Did I guess correctly? Did I understand you correctly? Am I correct? Is that correct? Am I right? Depending on the context, any of these could work. :)

Hello Pelin. Could you please give us more context?

They all sound fine. Just to clarify, it's spelled "understand". Here are some other ways to say, "Did I get it right?" Neutral / Common: Is that right? Is that correct? Did I understand correctly? Am I right? Casual: Did I nail it? Did I get it? Got it right? That sound about right? Polite / Formal: Have I understood that correctly? Is my understanding correct? Would that be accurate? Clarifying / Reflective: So, just to check—did I get that right? Let me see if I got this straight… I just want to make sure I got it right.