So I just read that antihistamines can seriously affect cervical mucus. So now I am wondering if that includes Zyrtec and singulair? My doctor knows I’m on these and didn’t say anything. I’ve noticed I don’t seem to have a whole lot of cm so is mucinex going to be enough to counter this? Do I need something more? I’m so confused and worried now. Maybe that’s why I’m not getting pregnant? Help! (I will call my doctor on Monday and ask but until then....)