Would urine culture and sensitivity test at first antenatal appointment show any sti's? midwife didn't give me a pap test but took blood and urine.

Urine tests screen: Blood and urine tests can typically cover appropriate screening in pre-natal care. Blood tests can check for HIV, hepatitis B surface antigen, and syphilis. Urine tests, beyond a culture and sensitivity, can detect gonorrhea and chlamydia. A Pap may be done at some point with HPV testing. There is not a good screening test for genital herpes; suspicious areas can be scraped or cultured.

Only if they look: Some institutions routinely look for STD's as part of prenatal care, but the testing is ordered specificity & in addition to simple urine screening.