PCOS Questions

For those with PCOS....how far along were you when you were/are pregnant? Did you have any false negatives? I took a test last week and it was negative, but I've been experiencing some pregnancy symptoms. Of course, this happened around Christmas time too and it turns out I wasn't pregnant. I guess it was just the PCOS flaring up. But, lately I've cut out gluten, 90% of white sugar, milk, and I've been exercising some. So, it's a little confusing to me why it would be the PCOS.