Periods coming and going

Megan

I had my baby May 13 and have been exclusively nursing. My period returned end of August (27th) and was very heavy. It’s now Oct 3rd and other than a few cramps, my period feels late. My husband had a vasectomy in June. I took a pregnancy test three days ago and it came back negative. I’m worried, though. Has anyone had their period come back and then skipped a month? No judgment please, only curious if this is normal with my period returning to normal.