Last week i had sex and it was rough to the point that i had pain in my lower abdomen but now i mainly have the pain when trying to poop?

Rectal Pain: Try sitz bath. It should ease off with time. Try Miralax (polyethylene glycol) or stool softner so you do not need to strain durin BM.

Anal fissure: May be an anal fissure. Sit in a warm bath to soak. Let yourself heal. Might be a good idea to see your primary care physician or OB-Gyn to rule out other damage including sexually transmitted disease.