Week late BFN

So, I had my son 2/15/14 and breastfed him for a year. I didn't get my first period after having him until May!!! We've been TTC a since January, so when I got it I was actually excited because it was easier to figure out when I was ovulating. Well, my first period lasted 28 days!!! Two weeks later I got my period again, lasted 6 days so I figured it was back to normal. Well now I'm a week late and have gotten 4 BFNs. 😭 BUT I'm a week late..... I'm so confused. Plus my sister just announced that she's pregnant and like 4 of our friends are pregnant. I JUST WANT A BFP!!