How long after a chemical did AF show up?

I’m scared I’m having a chemical because my BFP has turned into a BFN and I’m going to the doctor tomorrow for a test. AF is due tomorrow so I’m wondering if it’s going to come or if I should expect it to be late. 😔

Also, at the doctor, should I ask for a blood test? Or just the regular urine test? Or both? What can both of those test tell me?

I’m so confused and so shattered.