CD 50... Tmi

Has anyone had a similar experience and still got a BFP? Or have any advice... I am currently on cd 50, yes 50! My normal cycles average around 33 days and I have never gone over 36 days. Tested on cd 32, 39 & 45 all 3 BFNs, I couldn't chart or opk properly this cycle as away with work etc, I have been spotting intermittently for the past 2 week, some days only pink tinge in cm others only when I wipe it's red/pink. Never enough to wear a pad, some days there is nothing though so don't think it's just a light AF. What should I do?