Depo and Late Period

Hello,

I'm 26 and TTC,

Long story shortened for you.. I was on depo shot for a year due to endometriosis. Stopped depo April 2015. Period returned February 2016. Had a 35 day cycle then two cycles 28 days..

Haven't had a period since May 13. Period was due June 13 took a test on June 17 and got BFN.

Suggestions? Ideas? It's hard to tell anything because my period did just come back. Is it still regulating or is there a chance it's still too early to detect?