Discharge!?

Today while I was out at Babies r Us, I went to the restroom and peed. When I wiped, I had a chunk of discharge with a very light greenish tone. I don't itch or have any kind of odor. 
The picture above is similar in color but my discharge was a tad bit lighter. What does this mean? I am 7 months pregnant. It hasn't happened anymore except for at Babies r Us. 

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