Is ovulation spotting a common thing?

Hello, 
This is my first month using OPKs, today ( around 8 am) I got my first noticeable sign of LH in my urine. I was having a light cramping and my CF was watery/egg white-ish, so I decided to test again (around 3pm) & it was noticeably darker than the first test, so I took that as a good sign. 
The newest line is still lighter than the control line though, so it's probably not my surge yet, right?
Anyways, after I noticed the darker line I also noticed some spotting on my TP. Not enough to get on my underwear, just enough when I clean myself. It's gotten a little heavier within the last hour or two, but still only noticeable on TP. so my question is, has anyone experienced ovulation spotting? Is this ovulation spotting? Haha thanks for anyone's help😊