It’s recommended during pregnancy to adopt the habit of sleeping on your side, rather than on your back. Propping yourself against pillows in bed or sleeping with a pillow held between your legs can help keep you from rolling over in the night and increase airflow. It may be worthwhile to seek out a side-sleeping pregnancy pillow that is specifically designed to comfortably maintain your position.
If you’re experiencing hormone related congestion, there are decongestant medicines approved for use during pregnancy that can relieve pressure on your sinuses. Investigate other strategies that are broadly applied to naturally mitigate sleep apnea symptoms; anyone with sleep issues can benefit from safe levels of sunlight, exercise, and other habits that promote healthy, regular sleep.
Remember, consulting with a specialist is the only way to verify that you’re getting the airflow you need through the night. Professional sleep apnea treatment remains the best guarantee of relief.