I was diagnosed with PCOS in December 2016. Ive always had irregular periods, im on birth control. My last period was may 19 and it was very lit, like a drop of blood. I was suppose to start june 18th.. but I am seven days late. I took a pregnancy test on the 18th and it was negative. Could i be pregnant? Or should I relax given that i have PCOS, im on birth control, and the test was negative...