Bloodtesting with pregnancy?

Question

I was just wondering if by blood test doctors can tell if you have an STD, i'm not worried but i never got a vaginal check when I was first pregnant. Only a blood test, can you detect STDs with only a blood test? I'm 36 weeks already and i get my first vaginal check up on Monday to see if i'm dialated. Thanks

Answer 1

Some are detected with blood tests like HIV which is always offered during pregnancy.  Some are found through urine tests, others by swabs done during your papsmear.

Answer 2

Some STD's can be detected by blood test, others only by examination/swabbing.

Answer 3

The blood tests they do in the beginning look for HIV and Chlamidia.  The swabs done are for group b strep (not an std.)