Yellow discharge

Recently I finished my period it was a light cycle I ever had. I did have sex after my period finished, I did felt irritated afterwards, After that I have been having like a yellow discharge, idk if it because of my period/ sex or the medications that was affecting my body or something else.

Any help I’ve never had this before

*Late Update*

went to the doctor and it ended up being BV and Vaginitis from the test he did