Talk to Gynecologist on Gynecology

AOA. I am 31 weeks pregnant. I have one daughter, 4 years old. Had IUD in 2nd pregnancy, Dec 2017, due to IUGR at 30 weeks. Now Alhamdulillah, 31 weeks. But my cervical length is 3.3 cm. So i have been told there are chances of pre-term labor. I want to ask to what extent I need to have bed rest and palcvic rest? My second issue is that my TSH level is 3.28 at 31 weeks. What are the risks and what medication i need for this?

Please guide me, i am worried because of my history. My reports for TSH are attached