I think it's over

So I really need help here. I don't temp but I have a fitbit and I have posted my rhr. Can anyone see from that if I've actually ovulated and why am i zigzagging instead of going up ? I'm worried I haven't ovulated at all as I've also posted a photo of my opk and this is all I've had all month one line completely blank the other side. Does anyone have any insight into if I did ovulate and whats happening here. I should also mention after af my rhr shot up to 77 which it doesn't usually do.im worried that I've stopped ovulating and my baby days are over. Btw I'm about 7/8 dpo af due again in 7 days