Hi, Pegasus homeopathic Hayfever pillules. They work magic and are 100% safe for pregnancy and breastfeeding.
I'm currently using the "Muco drainol" too for hectic slime on my chest and they have a Sinus one for that icky sinusitis relief you might need too.
Really awesome stuff and I promise you, it works.
Might also consider a few drops (very few) of Eucalyptus oil in boiling water to clear blocked nose and open your chest - just breathe it in. Also nice to keep next to the bed so you have some relief whilst sleeping.
Hope this isn't too late
Good luck with the soon to be birth!