Ovulation or building humm to me it looks ov all the way but I do know that some have incredible swelling while building.

Instead of worrying about if it's one or the other just follow her behavior from here on out. In the next few days if you see her bowl wrapping and laying cold then she didn't ovulate. If she's glued to the heat in a nice tight coil and shed 10-15days later bingo it's hammer time baby.

Either way I'd keep breeding her and practicing my palpating

ps My name shouldn't be on the title of this thread. That being said I don't mind sharing my vast months of experience.lol