Nexplanon users?

So I've been on this for about a year & usually my periods are heavy enough for me to KNOW it's a period. However this month it's very light, light enough to just wear a panty liner & in the last 2 days there's only been a drop of blood. There is a little bit of blood when I wipe but it's not bright or "fresh" looking lol. Have any of you ever experienced a period like this?