Evenity/Blue sweat????

I took my first Evenity injection two weeks ago. There may not be any connection to this but now I am noticing that my bed linens have a large blue/purple area where my hips and legs would lie. Also I use a knee pillow and that cover has also turned this blue color. This has just happened in the last week. Nothing has changed in night time bed clothes. I sleep in a pj top and my underwear which are white. Just trying to figure out what this is and why it started. Thanks!