TTC, still breastfeeding my 1 yr old.

So, my S/O and I are currently ttc, my period has been irregular since i started getting it back after I delivered my baby boy last March (3/8/18). I track it with this app. My last period was February 6th-13th. According to the app, i was supposed to start today, i dont know what to follow. Advice would be greatly appreciated. Ty! :)