issue with orgasmn?

So my husband and i have been having sex for a while & we have one baby and i’ve got three of my own and he has another set of three of his own. every single time i’ve had sex... with anybody. i don’t know if i have an orgasmn or not. how can you tell you’ve had one? i don’t know if my orgasmn are really mild or what but i can’t even tell if i’m having one and he’s great in bed too!