He said he cummed a little bit?

Cassidy
Okay so, my SO and I have protected sex (condom with spermicide and he pulls out when he feels he's about to cum) and sometimes, he says he experiences a feeling of only cumming a little bit? Is this even possible? Like, I mean, I asked him "are you sure it's just not a lot of precum coming out?" and he says "no it felt like I legitimately came, but only a little bit". He tries his best to not cum too early and he pulls me off when he gets close to cumming (to be safe and to last longer) what I wanna know is, do other couples experience this? Sometimes he's totally unsure if he came "a little bit" or not. It gets confusing and honestly scary because I want him to ALWAYS pull out when he feels like he's about to cum. Any feedback?