Barely breastfeeding - irregular periods

Hi all. I posted about this the other day but maybe didn’t focus on the right question.

I am 11 months post partum, and only breastfeed once a day for barely 10 mins. Baby is happily weaned and has been for some months.

I had my first period pp on the 1st Dec, then another 1st Jan. I’ve not had one yet in Feb but all pregnancy tests are negative so far. I haven’t tracked ovulation but will do once we start TTC again.

Have other (barely) breastfeeding mums had irregular cycles like this? It just feels weird that my other 2 periods started on the same day and that my tiny bit of breastfeeding I do now would affect my cycle so much?