ADVICE NEEDED PLS

Ley
I'm due to start my first injection at 9:00 tonight it's day 21 of my cycle. I've started spotting I'm worried this might turn out to be cycle day 1, do I still inject later? I've tried to call my clinic but they are closed. There's only a number for emergencies. I don't want to mess this up as its private <a href="https://glowing.com/glow-fertility-program">Ivf</a>/Icsi and I can't afford to do it again. 
Please help, thank you x