Can pumping make you skip a period?

Leanna • Girl Mom ❤️ Isabelle Jade 7-9-14 Olivia Skye 8-24-18 ❤️ wife of a drummer and engineer 🎼🥁 7 years and counting..

I exclusively pump. From what I’ve heard, it doesn’t do the same as breastfeeding with holding off your periods. I’ve had several periods since my daughter was born and the last 2 started a little over a week early, now I’m late by 6 days. I tested on the 3rd late day and it was negative. Are they just out of whack from pumping? Or should I test again?