AF 12 days late; Frustrated and confused ๐Ÿ˜ฃ

AF was due 10/21 it is now 11/3 and CD 50. Every HPT is negative. I'm normally pretty regular, maybe a day off here or there. DH and I have been ttc for 17 cycles. Went the the gyn on Monday for a coloscopy. She told me if AF doesn't show in a week to take another hpt and give her a call. Yesterday night I took an opk on a whim and it was positive. I have no Idea what to make of it. Am I ovulating? Im trying to stay hopeful but it is getting hard ladies. Anyone else been through this and turned out to be pregnant? Sorry for the rant, I am just so incredibly frustrated. ๐Ÿ˜ฅ