Period after birth..

Lucero
So after giving birth in March, I finally got my period last month. I got my period May 18th. So I was expecting it around the same time for June. I use the app period tracker & it lets me know how many days I'm late & I'm a week late. Could it be because I'm breastfeeding? Is it just irregular? Should I really be worrying a lot? 
Ooh I should mention I am sexually active, but we use condoms. He usually pulls out when he's about to cum in the condom. So there's no way I could be pregnant again. Well at least I'm hoping not anytime soon.