Cervical changes

I struggle with temping due to the fact that my kids wake me up 1000000 times a night (okay slight exaggeration) but I’ve been tracking cm and cp for a long time now. I was wondering, as I haven’t found much literature on it- is there a certain time frame in which your cervix closes post ovulation? Is it like 24 hrs? And same with cm- if it’s been watery/ewcm and then slightly creamy/ewcm and finally just creamy, when would you assume you ovulated? I realize there’s likely more room for error here but I’m just trying to make sense of it all. TIA