I was greatly reassured by other women when I had mine - my first pregnancy symptom! - and it doesn't seem to be uncommon. Just not that talked about, for some reason, can't think why LOL. Like you, it's only green sometimes, and only when I wipe - I'm not sure if it goes clear/white if left for a bit (have to experiment now LOL) or just waits for me to wipe. I hope you get good results back soon.