Irregular period is new for me

Connie • Savannah's mommy ♥️ March 11, 2019 🤱

I am currently breastfeeding my baby girl. She will be 9 months on dec. 11. I got my period back for the first time in August. It came again like normal in Sept. and Oct. but now in November it still hasn't arrived. (About 2 weeks late right now). I have taken a few pregnancy tests on separate occasions and all were negative. I am on the pill (can't remember the name but it's the one you can take while breastfeeding). My whole life I've always had very regular periods. Is this normal still for postpartum or breastfeeding? Been so worried I'm pregnant again!