As far as I know, your syns will stay the same, 5-15 a day, but the maximum syn allowance can increase if your BMI is high.
As for your A & B allowances, look at this website. It's one SW created for trying get/ already are pregnant/breastfeeding women
http://www.slimmingworld.co.uk/rcm/
You get 2xA and 2xB choices to use also.
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