Pregnant?

Kayla
EBF my almost 3mo old, <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> says I'm 2days late and my nipples have been sore while nursing ... And I've also gotten some pretty crucial headaches the past 2days as well... Not on birth control ; were doing the "pull-out" method. Anyone have experience or insight ?