I have slight pain on left side of stomach if my husband and i have unprotected sex.i usually dont have an issue if he doesn't ejaculate inside. ?

No relationship: Get a pelvic and GYN exam. Ejaculation should not cause pain. Certainly position, depth of penetration, lack of lubrication or internal vaginal issues could be a possibility. Please make sure that you are adequately lubricated and spend 15-20 minutes on foreplay.

See your GYNE : You only have pain when your husband ejaculates? I doubt that the ejaculation itself is the cause for pain. More likely, his movements at that time are different & cause you pain. Also, you may have something like a painful ovarian cyst. Do get examined if this becomes problematic & interferes with your activities & quality of life. Hope that helps.