periods after failed IVF

Emma
I had a chemical pregnancy back in November last year after our first FET. My December period was 4 weeks after the loss. My January period was then 4 weeks after that. So all seemed pretty normal. Then February was 36 days after my jan cycle. Today I noticed light pink spotting. No cramps or anything. I'm due to start hormones 21days after my next period which would be this month, but I only had my last period 19 days ago and should y be due on for another 10 days. Anyone else had anything similar to this?