What's the latest you found out you were pregnant?

I am currently on cycle day 54 it says I haven't had a period since June 19th I usually start my period every month around the 19th or 20th so it's abnormal to me. I took a test on August 4 and it was negative. I have a gyno appointment on the 9th of next month so I will defiantly find out then. Just wondering what was the latest anyone has found out they were pregnant or anyone in the same situation. Really hoping for that positive! ♡