Blood clot

Okay so this has never happened to me before. But I ended my period 2 days ago and me and my boyfriend had sex tonight and I noticed something on his belly and so I shined my flashlight and he had a blood clot from me and I had blood as well. Has this happened to anybody else? Is it normal to still pass a blood clot after your period is completely done? Like I went through the brown old blood and everything and I had a bright red blood clot. I don’t know maybe it’s nothing but just need some reassurance I guess.