Sayang, LUTO is something that really needs proper medical guidance, please make sure you're under the care of a fetal medicine specialist or maternal-fetal medicine doctor who can monitor this closely for you. I know it's scary, especially with your first baby, but they'll have the best plan tailored to your situation. I haven't personally heard of cases around me, but honestly this is one where you'd want to connect with your doctor's support network or even ask if there are patient groups, sometimes hospitals can connect you with other mums who've been through similar. Sending you strength, mama.