Your probably just farther along than they think. I've heard it's common for some woman to not have HPT show postive until much later...sometimes I've heard never...even when they are pregnant.
Not sure how that is possible???
BUt I just wanted to wish you congradulations!!! An ultrasound will help determine how far along you are and how many you may be carrying.
With PCOS...maybe you naturally ovulated with more than one egg...since ovulation is all screwy anyways...or maybe it split and you have identicals
. But my guess is that you have one little bean in their already growing big and strong!!!