Congrats on your pregnancy! Honestly, booster shots during pregnancy are generally considered safe by doctors, a few of my mum friends did theirs while pregnant and they were fine, just normal arm soreness or maybe slight fatigue la. The best thing is to confirm dengan your doctor at your appointment itself, especially since you're already booked; they can address your specific concerns and discuss any side effects yang possible based on your health history. Better to feel reassured from the expert directly, kan?