Checked on your chart there, and you're right, it would be hard to determine when you ovulated, although from that rise, you definitely did pop an egg.
I'm not seeing lines on your tests...the last test looks like POSSIBLY an evap, but I just couldn't say one way or another. I hate to be the bearer of bad news, or the negative voice on here, but I keep seeing BFN's from your tests. I hope I'm wrong!!! I just hate on the testing section on BnB how EVERYONE always sees lines! And I'm sitting there, squinting, tilting my screen, etc., and I can't see anything! I refuse to give anyone false hope, and after all you've been through recently, you don't need any more let-downs. Again, I could be, and hope, that I'm completely wrong!!!