How do I know if I'm not tight?

Okay so my fiancé is the first guy I've ever had sex with and I was the first girl he ever slept with so everything we've experienced was together. But I'm scared I might be lose down there....is that possible? Like if we have to much sex together can I get lose? Because I'm scared to ask him how it feels for him and for him to give me an answer I might not like 😐