During the third trimester, your blood tests may be done again. You may also have glucose testing at this time.

The procedure is painless and takes less than one-half hour. You may be able to see your baby, or you may even be given a copy of the sonogram to take home with you.

In rare cases, a woman who has group B strep can infect her baby during the birth. Infection can cause serious illness in the newborn.