During the beginning of my pregnancy I had a nasty cough with mucus and decided to try natural home remedies to make sure baby would be ok. Anytime I would blow my nose or cough my boyfriend would be concerned. I contacted my doctor and he said everything is fine. Baby is well protected.
The embryo is fine, it is happily floating around in your uterus and it doesn't feel a thing. Nasal congestion is very common. We can't take the usual cold meds in the first trimester.
I use Sinus Rinse, it is drug free and i find it to be more effective than many decongestants.
You can also breathe steam and drink tea.
If it is allergies making you sneeze, zyrtec is safe in the first trimester.