**TMI** CM photo & question

I really don't understand the difference between the different types of CM. This morning I had very wet underwear and when I inspected, there was a large amount of watery but slightly cloudy fluid, definetly not EWCM. I had a shower and changed my underwear and a few hours later this is what my underwear looks like.... It's completely dry but it must have had some moisture to it when it came out surely?

I really don't feel comfortable inserting a finger to inspect so any information or advice you can provide about examining underwear for clues would be really useful :-)

I'm on CD 11 of a 35 day cycle, my fertile period doesn't start till the end of this week.

Thank you.