Talk to Gynecologist on Difficulty In Breathing

Aoa i m 26 weeks pregnant. I m facing a problem from the last two months on n off. I m unable to breath properly at night and cant sleep due to that. I feel like something is blocking at the end of nasal passge or the upside throat. Which makes me uncomfortable n sleepless all night. I sudden awake from sleep feeling like something blocked my throat from upper jaw side back to nose. I have consulted GP n gyne 2 months back n done with me thyroid test. T4 was 12. GP suggested an antiallergic tab for 10 days. I got relief that time but still problem is there. Should i consult ENT ? I m thankful to you if you help me n get me out of this problem.