What Causes Bleeding In Women After Intercourse?

doc when ever i and my husband do relation within 15 days of my mensutral date i start bleeding. i also hve pain at the lower bottom left end in my abdomen. I am 32 yrs old my hgt is 156 cm and wt is 56 kg earlier i use to hve problems of ulcers on my uterus and it has been cotrized for 3 times