Best to test before fertility appointment ?

Nat • Grave’s Disease Warrior 🦋

We have a fertility appointment on Thursday due to our recurring miscarriages. AF is due anytime between Thursday and Saturday. I have been feeling the tell tale sickness I’ve had previously with the sickly cramping. Would it be worth testing before we go Thursday and if we are pregnant would that mean we can’t see our specialist? I’m not sure whether it is worth waiting or not.