J.F.
I believe Benadryl and Sudafed are approved (check out http://www.kellymom.com/health/index.html) but I'm not 100% sure.
I know of a mom who was just prescribed Allegra and Nasanex and she is nursing. I believe the safest is nasal sprays because they do not enter the blood stream, but you're doing the right thing by calling your doc.
You can also try drinking apple cider vinegar (no experience there but I've heard it recommended many times) and a Neti pot.
Hope you get to feeling better soon and congrats on the little one!