I had a bad cold at 6 weeks. I just did steam therapy and Vicks Vapo Rub. I was afraid to take any pills. Cold was gone in a week, so I had one really crappy week.
I'm 6 weeks too and I also have a horrendous cold. My Dr recommended original Sudafed, the every 4 hours kind. It's inconvenient, but easier to control dosages so I only take the minimum amount of medicine to control my symptoms.