I had sex about 3 weeks ago without a condom within that time my period came on a little different smelling than usual (stronger)! After my period went off i was having watery yellow discharge with a smell so i went to the doctor told him about the discharge and discomfort he said usual its an std so he tested for gonorrhea and chlamydia and gave me a shot and pills just in case it was which came out negative could it be another std like trich or something like BV??