Scanty period before first ever IVF cycle

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Ladies I'm freaking out,
Can you start <a href="https://glowing.com/glow-fertility-program">IVF</a> is you have had the lighter period ever! To the point where you wear a pad and there's nothing on it? 
I feel cramping for 2 days now but only see blood when I wipe at the bathroom. This is not normal for me.
I have pcos since my teens, and had long cycles and 6/7day periods now in the last tear I have seen them drop to 4-3 days light & now to this - zero flow???
I also was diagnosed hypothyroid in 2014.. I'm so worried this will screw up <a href="https://glowing.com/glow-fertility-program">IVF</a>.. I'm scared it's something horns only sinister going on like perimenopause - I'm 33 😬
Hope some out there can share some experiences it advice with me ??
Thank you so very much for reading and commenting I am totally scared right now