No period! BFN

Kinda wanted to hear others take on what might be happening with me. So I went on the pill after having my son in 2015. All fine. Periods were regular. Now ready for by #2. Stopped taking The pill in December 2016. Didn't have a period until march 2017. Had a -what seemed like- a normal period. And that was it. Now again after march- no period. It's now coming up on august 2017. I did take a few tests in April when I didn't get a period again. And all were negative! Anyone have any ideas what could be going on ? Any go thru anything similar ? (Will be making a drs appt soon)