BBT not moving much :(

Katie
Hi all I came off the pill just over a month ago and have been charting my BBT since and it looks like this:
It's not really moving more than 0.2-0.3 degrees and is basically hovering around 36.8 - does this mean I haven't ovulated yet? Was hoping to see a rise as confirmation that I'd ovulated!
No idea when AF will make an appearance - could AF come even without me having ovulated this cycle? Then hopefully ovulate next cycle...?
(I'm not yet TTC as I can't start yet due to a holiday I've booked and potentially - if it happens quickly -being too pregnant to fly, but will be wanting to start next month)