Can stopping breastfeeding affect ovulation?!

Hello everyone! I love this Glow Community! I have a question and wondering if anyone can relate!

I just weaned my 17 month old on July 18th, during my fertile window (according to Glow lol) I got my first postpartum period back in May, at 15 months! My cycles have always been very regular! Even the last 2 were spot on! But I’m currently 4 days late with a negative pregnancy test this morning!

My question: is it possible weaning can cause a change in your cycles or affect ovulation?!

Thanks in advance!!