1 month old w/ cold, call doctor?

BoyMom👣 • • Ryder 06.28.18 | Rylan 01.07.20 •

Everyone in my house has had either a virus (grandparents) or hay fever (my 19 month old and myself) and I believe my newborn is coming down with a cold. Earlier he was choking on his post nasal drip so I called and they said to use saline drops and a suction bulb and see if it gets better. Well it hasn’t and he is now coughing and sneezing, should I call even though it’s after hours?