I'm sorry your chart is confusing, Tobi. Some people's BBT is more sensitive to changes in sleeping patterns. I would think that next cycle, once you are settled into your summer pattern, your chart will be more clear.
It is possible that you O'd and your temps are just a little funky from the sleep changes, or that you haven't O'd and you will either surge again or have an anovulatory cycle. If I were you I would continue to temp and use the monitor. If you don't get a period when you expect based on the O date or have another surge with a clear temp shift, take a hpt.
Your temps may pop back up into a clearer pattern, too. Some people do get a bit of a dip for a couple days after O.
Good luck! Hopefully this is your cycle and you won't need to worry about this next month