TTC with PCOS

Meegan

I am 32 and have PCOS. Me and DP have been TTC for 9 months now. My cycle is anywhere between 27 days and 64 with the average being 36 over the past 2 years. I am on day 53 right now and fingers crossed this is the month. I took a preg test on day 51 and it was negative. Would it be possible that I could still be pregnant even though the test was negative? When would be a good time to get a blood test. I was thinking if I went over day 64..