Hard time breathing, nose clogged all the time

So im looking for some ways to help me breath a little better. I have allergies and asthma but I think me getting pregnant has made my allergies much worst. My nose is constantly clogged but is still runny so im constantly blowing my nose or coughing to clear up my breathing. Nighttime is the worst can't breath through my nose at all so I sleep with my mouth open and then my mouth gets super dry , so I wake up more. So please any suggestions​. Anybody else dealing with this?