Colds when TTC

So iv been whacked with the flu and im CD7 so O about a week away, i want to take something to ease my blocked runny sneezy nose and chest but have read that decongestants are bad to take when trying or early pregnancy as can cause birth defects and cause they dry up mucus ect they dry up that area aswell so no fertile mucus is produced, well clomid dries me up too much as is so i dont wanna risk that, then its also shown that cough medicines containing "guaifenesin" help you produce more fertile fluid and has helped alot of couples concieve, with this, what does everyone hurd, what do use use and what do u know actually works and whats to avoid,,