As long as your bottle is still sealed - it should be fine. If I were facing your challenge, I would be doing a lot of steaming in a hot shower - this will help to break up the congestion, so you can move it out. Any type of essential oil you have, such as eucalyptus, which will help to open up the bronchial tubes would be good to use. The best way to get full benefit from them would be to use an oil diffuser or a hot water vaporizer with the oil in the water. If you can afford to get a massage and/or a chiropractic adjustment, this will also help to move things through faster. Fresh juicing would be a great way to get live enzymes and vitamin C (citrus juices) into your system to help combat this. Make sure you're drinking lots of fluids and getting a lot of rest, so you're body has what it needs to take care of you and the baby.