Hot water with lemon juice, ginger and honey for your throat. You can either make some ginger tea and add lemon and honey, or whirl some fresh ginger root in your blender with a little water then strain. Make up enough to keep a jar in your refrigerator and then you can just use a tablespoon whenever you make a cup.
Also, echinacea is safe during pregnancy, you just don't want a blend with other herbs. That being said, it might not be that effective now that the cold has set it. It's most effective when you take it at the first sign of symptoms.
Otherwise, I would look at some homeopathic remedies. Boiron makes some good ones for colds. You can also read the descriptions for the single remedies and see which ones fit your symptoms.
If you only have congestion and cough and no fever, I would think it might be allergies. If the neti-pot isn't a possibility for you, then get some saline spray for your nose.