Pregnancy rhinitis??? HELP please!!!

So about a week after I believe I conceived, I started having a really bad post nasal drip, cough, and nasal congestion. It hasn’t stopped for 2 weeks and I’ve been coughing up all the mucus I can for a week and it’s not getting better. I got a faint positive hpt on Tuesday, more faint positive on Wednesday, also missed my period Wednesday and still sick. My pregnancy tests aren’t getting stronger, waiting to test again in a week. Help???