could you sweet ladies give me some advice?

KM
My last period was Aug 12-16! I'm very regular every 28-30 days. September comes and I noticed I didn't start my period, by this time I was already 2 weeks late. I took a test and it was negative. I've taken several test since then, and still negative, I'm supposed to start my October period next week. 
Has anyone gone through this before?
​-2 years ago, I was told I had PCOS--while they were telling me this, I was pregnant, almost 7 weeks. and I've never had a problem with my period since.  so they were wrong, I do not have PCOS and they should probably head back to school. -sorry I hated my doctor.
​Could anyone give me some advice? please?  

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