Hello! I'm 19 years old, and have had regular periods since I first got them at 6 years old. Yes, 6! My sister has PCOS, although she has never had any cysts and when I went to the doctor a few years ago and explained my awful cramps during my period she prescribed me metformin. This is the first time in my life I've missed a period, the tests came back negative, doctor didn't really take me seriously which made me mad ;l. I had raging heartburn so she prescribed me zantac. It worked, but then I missed another period. I went back and asked for a different doctor. I then demanded an LH blood test,pee stick , and an ultrasound. LH came out elevated (which can be a sign of PCOS, early menopause or ovary failure) and hcG didn't read at all. I'm now 4 months pregnant with twins. My doc said sometimes women have levels TOO high of hcg and they don't read on pregnancy tests. It's called the Hook Effect. So I thought I would share my experience. Don't give up.. make sure your doctors do every test that you want. That's what they are there for.