Lost mucus plug?

I know there's a lot of posts about mucus plugs already but I'm kinda freaking out so I have to post one myself. I'm 39+0 and just went to the bathroom to pee before I go to bed (it's 12:30 am where I am) anyways I think I lost my mucus plug. I didn't want to take a picture and post it cause that's a bit gross but when I wiped there was what looked like old blood (almost black) and slimy discharge on the toilet paper. Was that my mucus plug? If so is it safe for me to go to bed or do I have to go to my hospital now? It's half an hour away by the way. I'm a FTM so I have no idea what's going on and I'm slightly terrified