Hello, There are several of these plants growing in the unmowed section of my yard. I took some pictures, but the color of the flowers is a bit off. The outside of the petals is pink while the inside is white. The plants grow low to the ground, seem to be expanding by rhizomes, and the flowers come off the stem in a cluster of 4.

I looked and looked in my ID book but couldn't find any matches except for possible Trailing Arbutus.

Thanks for any help!