My friend WAS tested in the UK RF (wanted to say Ryn then!), at 34 weeks. She was brought in to be induced at 38wks, so she could have anti-b's before and during labour. Her induction failed and she was given an emergency c-section. The epidural didn't work so she had to have a general, she never managed to get DS breastfeeding (which she'd really wanted to) and was treated for PND for nearly 3 years. The on-admission-to-hospital-pre-anti-b swabs, taken 4 weeks after her +ve results, came up -ve. She was, understandably, utterly devastated. That's why they don't routinely test in the UK, it can come and go.

Bx