Hey mama,
For the benefit of mamas who are reading, hormonal imbalances can cause the swelling of your nasal passages and the production of more mucous.
This article suggests a saline rinse or irrigation:
https://www.hellomotherhood.com/article/541916-thick-mucus-when-pregnant/
Other articles have suggested not consuming too much creamy stuff so that the mucous doesn’t get thick and irritating - it also prevents more mucous from being produced.
Hope this helps mama.
Fatihah Kamarudin