Sore and tender breasts at the end of ovulation?!

Natalie • Baby #1 conceived after month #2 and due April 9th 2015 ☺️
Hi there.
​So this is my first with Glow and first month of trying to concieve. For the last few days of my ovulation/fertile days and a day afterwards I've had quite sore and tender breasts. My nipples have also been rather sensitive too. Which I've never experienced in the past during ovulation. 
​My period isn't due for another two weeks and I don't usually get period symptoms until a few days before hand. 
​I've added in a photo of my cycle and activity so if anyone could help it would be muchly appreciated!  
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