late day 6!?

I posted this earlier, but I’m still just sitting here in my head so I’m posting again, with my details.

I am needing some help!

I am late 6 days on my period but a preg test isn’t showing a positive. I’m pretty sure I would have conceived on the 18th. If that’s the case the implantation would have ended on the 25th?? and a positive doesn’t show up until abt 10 days after implantation. Did I catch it right on time? Am I pregnant? And it be right on to stop my period but not show on a test??? Help. Were going crazy. I’ve tried everything from going to the hospital and them saying I’m late but not preg. I’m having milky white discharge. my periods are always on time, I can prove that with this app, bc that’s the reason I got it. I just now took another test and it’s negative. Is it too early for hcg levels? But right on time with stopping my period. Someone help me or pm me.