Long term bc pill usage

Tonya
I had been on the pill for over ten years. This is my first time TTC. I was put on BC for PCOS (no ultrasound just diagnosed from irregular periods)  Since then I have lost 50+ pounds, which my gyn said would help regulate. I am now almost a week late and have had two negative HPT'S with afternoon urine. Should I take another test after a week with morning urine because it may have been diluted or am I probably not pregnant? How long does it take to get the hormones out of your system? How long after stopping bc did you get pregnant and were you diagnosed with PCOS?