Okay now I'm really confused....

So, the last couple weeks I've been taking pregnancy tests and I think I've been getting faint positives but then I took another one this morning thinking it would be darker if I really am pregnant. But no such luck. And I had (what I thought) was implantation spotting two weeks ago. it was very light and lasted just a couple days. So if it was, then wouldn't I be getting darker positives by now? I have PCOS so I don't know when I could've ovulated. should I call the Dr now? Or wait? Glow says my period is "supposed" to start on the 22nd. sooo confused. ☹