Pregnant again?!?

Little one was born on 7/31 got my first period on 10/13 and it lasted 5 days so that means I should have got my period again on 11/10. It’s now 11/15 and I still haven’t got my period and I am starting to panic, we have had sex (protected, I’m not on bc though) and I am ebf. Could the breastfeeding be what’s throwing me off? I am usually a very consistent person when it comes to my periods which is why I’m kinda becoming nervous.