1 day period? / Period after full weaning

So after 30 odd days, I bled for a few hours, only a light flow. I would wipe blood into a tissue but never enough for it to be in the toilet.

I weaned my 2 year old at the beginning of October so I’m guessing things are still a bit all over the place but I’ve never had a 1 day period before? As his feeds dropped, my cycles dropped to 12-17 days in length. Now they’re back up to around 30 days. However, my period on my last cycle was 9 days.

Anyone else experience anything like this?

I’ve spoken to my GP already who said to watch things for a few months before they jump into tests or anything