Mucinex DM

I have a cold I’ve had for a few weeks. It’s not getting worse but it’s not better. just some slight sneezing and stuffy nose. My OB gave me a print out list of over the counter medications that are safe and mucinex DM was on it but now I’m reading on this forum that it’s not safe during pregnancy (I’m 16 weeks). I don’t know what to do. Is it bad if i just take nothing and wait for it to go away on its own? Or should I take the mucinex. I hate that there is such conflicting info on something so important.