The recommended dose is - 3 g intravenous benzylpenicillin be given as soon as possible after the onset of labour  and 1.5 g 4 hourly until delivery.
The first dose should be given at least 4 hours prior to delivery.

Read about Intrapartum Care in VBAC-

https://obgresource.com/2021/12/10/intrapartum-care-in-vbac-2/

- For pregnancies at more than 16 weeks of gestation the term low-lying placenta should be used when the placental edge is less than 20 mm from the internal os on transabdominal or transvaginal scanning (TVS).

• The term placenta praevia should be used when the placenta lies directly over the internal os.

The algorithm suggested by RCOG for low lying placenta can be accessed HERE 

It is not necessary to administer anti-D Ig to D negative females without childbearing potential, or males who receive D positive platelets.

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After collection, swabs should be placed in a non-nutrient transport medium, such as Amies or Stuart. Specimens should be transported and processed as soon as possible. If processing is delayed, specimens should be refrigerated. When testing for GBS, the lab should be specifically informed that the swab is for GBS testing.

The UK National Screening Committee examined the issue of strategies recommended that routine screening using bacteriological culture or near-patient testing techniques should not be introduced into UK practice.

The US Guidelines advise that all pregnant women should be offered screening for GBS carriage at 35–37 weeks of gestation and those found to be colonised with GBS should be offered intrapartum antibiotic prophylaxis.

Systemic chemotherapy is contraindicated in the first trimester because of a high rate of fetal
abnormality,but is safe from the second trimester.

- For pregnancies at more than 16 weeks of gestation the term low-lying placenta should be used when the placental edge is less than 20 mm from the internal os on transabdominal or transvaginal scanning (TVS).

If the distance between the internal os and the placental edge is 20 mm or more on TVS, the placental location should be recorded as normal and managed as per routine

• The term placenta praevia should be used when the placenta lies directly over the internal os.

If the placenta is thought to be low lying (less than 20 mm from the internal os) or praevia
(covering the os) at the routine fetal anomaly scan, a follow-up ultrasound examination
including a TVS is recommended at 32 weeks of gestation to diagnose persistent low-lying
placenta and/or placenta praevia.

Use of TVS- to accurately see the placental edge. Also, cervical length is a predictor of antepartum bleeding and emergency preterm caesarean section in placenta praevia. Women with a cervical length of less than 31 mm have a 16 times higher risk of emergency
caesarean section due to massive haemorrhage.

• If the history suggests that the reaction described is not likely to be allergic in nature then penicillin should be given.
• If the history suggests an allergy to beta-lactams, but one that is not severe(i.e. no anaphylaxis, angioedema, respiratory distress or urticaria), then a cephalosporin can be administered.
• If the allergy to beta-lactams is severe then intravenous vancomycin is recommended.

Women are generally advised to wait for at least 2 years after treatment for breast cancer before
conception.

Non-hormonal contraceptive methods are recommended.

According to UKMEC- For women with 'Current breast cancer' , Cu IUCD is Category 1 , all other contraceptive methods are category 4.

For women with 'Past' breast cancer' , Cu IUCD is Category 1 , all other contraceptive methods are category 3.

Risk of anal sphincter injury in women undergoing VBAC is 5%.

Birthweight is the strongest predictor of anal sphincter injury in women undergoing VBAC.