there is no way to know if your at the 'your close to lost' mark.
if your 6 to 4 hops from that mark (if you are going right at it), your bug friend turns green.
if your 4 to 2 hops from that mark (if you are going right at it), your bug friend turns yellow.
if your 2 to 0 hops from that mark (if you are going right at it), your bug friend turns red.
if you are not in these ranges, the bug will be it's normal pink.