Ejaculating orgasm instead of prostate?

So I've been trying to achieve a prostate orgasm for a while now and I'm to the point where it feels really good however the feeling to me seems like a normal orgasm slowly slowly building until it feels like I'm in that moment right before ejaculation except extended. Recently however while I was doing this I had an explosive normal ejaculatory orgasm that felt amazing however left me not wanting to continue(I didn't touch my penis the entire session, I did however push it between my legs and maybe that was enough to do it?). I know this isn't a prostate orgasm but this is always what it feels like I'm working towards. A normal orgasm just stronger and slower. Is this normal? I read that it's supposed to feel completely different and that you're not supposed to cum or use normal orgasms as a reference point. Am I doing something wrong ? I hear it's supposed to feel like you have to pee and then build up from that but for me it feels really good but feels like a normal orgasm slowly building and at the peak I get powerful contractions that feel really good. This is the first time I've came but I still feel like I'm chasing the wrong feeling. Any advice ?