Still no period

so I'm three days late and took a pg test at 14dpo it was negative tomorrow if AF still doesn't show I will be 17 dpo plan on taking a test not sure what to really do I use to have very irregular periods until I started to see a fertility doctor for a good year was on metformin Clomid and some shot my husband and I have decided to take a break due to paying for our wedding and it was very emotional as we have been trying for 3 years before that with still no luck but after I stopped all meds my period came regularly for a year and now I'm three days late I have another fertility appointment on the 9th to start again but if this one is negative should I just wait for the appointment to tell them I'm late or just wait ???