Advice! CM after Sex,

Sam • Mum of a 2yr old daughter, recovering from a complete molar pregnancy, Adoring fiancé, looking forward to TTC again
So to my calculations (and glows) I'm in my fertile window, but my ovulation is predicted to be on Monday 13th, 
​we had sex last night and Today I had EWCM,  so my question is.. Is this my ovulation coming earlier than I thought or does your CM change a bit after sperm? 
​✨✨ baby dust to you all