when u love some one can they tell

How soon is too soon to say "I Love You"? Cause some people say that shit as if they're trying to catch feelings and speak faster than the speed of light. I'm not talking about getting pregnant and loving the child 5 minutes after peeing on a tube. I'm talking about...you smut someone and the sex wasn't even that good...but just because you exchanged bodily fluids or let someone pee on you it's gotta be Love. GTFOH!!!