Had sex last night some what rough. today i started spotting but now it's more dark but not heavy flow?

Normal: Generally you should be able to have sex without bleeding, but a small amount of spotting after "rough"sex would likely be normal. Dark blood is usually old blood that has taken a while to come out - which is what would happen with some bleeding during the sex showing up the next day. If you continue to have bleeding after sex - then consider seeing your doctor