How do you know if you came during sex? Tell me some of your stories/experiences

Lol you guys, this a little bit of an embrassing topic to touch on. But I'm just going to make this story short. So me and my boyfriend had sex and after he had already came he said I came before him.... Here is the deal. I don't even know if I came or not but it was pleasurable and I did like it. He claims that he knows that I came because he "felt it." When Tbh I don't even know my goddamn self if I came or not. But I agreed with his know it all ass to make him feel good so....Since we're all females on here I figure I'd find someone willing enough to tell me their experiences and describe to me what if feels like to cum during sex and how the hell id know if I did or not.