BW,

Call them. If you get the nurse who didn't want to know, explain that you can't get in touch with your FS and you would like to get advice on what to do, and that you were TOLD to call back if it got heavier. Do not hang up until you are happy, and if she still stonewalls you, explain that you are new to this and am not happy about being left to flounder like this.

remember you are paying them for this service!