Mucinex while breastfeeding???

Okay please tell me if it’s okay to take mucinex.

I have Covid and started coughing and read that I should take mucinex to keep it from getting bad.

I have asthma so all growing up I would get bronchitis with every cold so now I’m scared of that.

I have little babies, one of them being 5 months old that is breastfed. It says on the box to ask before taking it so I called the pharmacy and they gave me a very vague answer. Like they are not completely sure. Pretty much a use at your own risk and if I do take it drink a lot of extra water. So I have taken 1 a day for the last 3 days and I Feel like I need it still but I am starting to have anxiety about it. Please tell me if you have ever taken it ? It is the 600mg one not the DM one