PLEASE HELP!

My husband and I had sex tonight. After everything was normal. We both fell asleep on the couch and when I woke up to go to bed I went to the bathroom first. I always put on a panty liner after sex and it had blood on it. When I wiped there was blood too. It looked like actual period blood and even had a small dark clot that you sometimes see with your period. My period needed on December 19 so I know that’s not what it is. Does anyone have any ideas? I’m kinda freaking out now!