Hi mum, I didn’t personally have scalp psoriasis during pregnancy, but I’ve heard from other mums that it can flare up because hormones really affect skin condition. Some managed it by using very gentle, fragrance-free shampoos, avoiding scratching, and keeping the scalp moisturised as much as possible without irritating it further. If it gets quite bad or itchy, I think best is still to check with your gynae or a skin doctor because not all medicated shampoos are safe during pregnancy. Hopefully it calms down soon for you, must be quite uncomfortable to deal with on top of pregnancy already.