At each visit, my nurse or I will tell you what to do next, as far as labs, sonograms, visits, etc. I also write instructions onto your basal body chart, as well as on a "follow-up instructions sheet". There is a window of time to call for appointments and lab work. If you are waiting for your period to come in for lab work, and your period stars on a weekend, just call Monday morning. We will work you in.