*TMI* Late period. Implantation bleeding? Negative Blood and HPT test

Kaila • Mother of 2 amazing boys!! Sirwayne Jr and Kyler!
I recently stopped birth control at the end of my April pack! I had a normal on time period May 7th,  according to all my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> My next AF was due June 4th-6th and I havent received a period or any spotting until last week and it was only A little bit.  My July period is now supposed to start this coming weekend. Could this spotting ive encountered be implantation bleeding and just to early to show on tests?  I have no idea whats goin on! Have any of you ladies ever experienced this??