I had itchiness over my tummy and arms too, came with rashes after I scratched them. Then I used the calamine lotion to soothe the itchiness temporarily as recommended by my gynae. I’ll apply skin moisturiser after 30 minutes to ensure I got my skin moistured, and it got better after 2 weeks
But if the itch really intolerable, can try to take piriton (antihistamine), this was advised by my gynae, hope these helps!