What is this?

My so and I just started ttc this week. We've used the withdrawal method up until then. 
My fertile window started weds,so we did the deed once or twice a day since then. Yesterday I noticed my CM changed from thin and clear to kind of thick and slightly white, and there's a lot more of it. No other weird changes or symptoms of an infection. 
This hasn't happened before and was just curious if anyone may know what's going on.

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