I just read the advice already given and most of it is very wise. A few more things you can do:
1) Colds are viruses - medicine only relieves the symptoms, not the cause. My tried and true cold reliever (give to me by an Oxfam nurse working in a refugee camp in Sudan in 1985, and used hundreds of time ever since..) is taking a hot steamy shower, two or three times a day. Steam up the bathroom as much as possible and then breathe through your mouth as deeply as you can, throughout the shower. This allows the congestion to soften and loosen, permitting your sinus passages and bronchial tubes to heal. Next, take two 500 mg tablets of non aspirin pain reliever (I used generic not brand name medications - but Tylenol is the equivalent) two or three times in 24 hours. This is NOT harmful to the baby (at 9 months gestation) and does not increase bleeding risk as aspirin might. It will fight the inflammation and allow your body to heal from the viral infection. Next, drink, drink and drink some more. Finally, as others have already told you, do a saline rinse (very easy - made at home one teaspoon of salt to one quart of warm water) of your nose two or three times a day. Then, gargle with a teaspoon of salt dissolved in a cup of very hot water. Finally, do some inhalations (Vick's, tiger balm, or just a bunch of rosemary, mint and bay leaves in a basin, covered with boiling hot water), then hold a towel over your head and breathe deeply for five minutes, again, through your mouth, not your nose).
2) Try acupuncunture! My midwife with my second child was also an acupuncturist. When I gave birth, in June, a terrible head cold started to come on with a few hours of giving birth. Contrary to what others say, I believe the pregnancy hormones offer super resistance during pregnancy, but the birth process somewhat lowers immunity for the mother. I complained to the midwife, and she offered me acupuncture that afternoon. I was in France, and gloriously, the hospital stay is a week, so I couldn't do all my home remedies - with the exception of the hot shower. Within HOURS, the cold symptoms had disappeared.
3) Relax! I agree that natural childbirth is the way to go, but assume that you have good reason for the induced labour. If you are stressed about the cold (or anything else) you are bound to have a more stressful childbirth experience. Meditate, sing, walk, laugh, do whatever it takes to relax and heal yourself, and remember the joy of having a new baby soon. It will surely nip put your anxiety in the bud.