Late period on nexplanon?

I've already had it in for a year and a half. My first year I had no periods. Then they came back, light but generally on time.

eve is telling me I'm 12 days late for this one. I've been getting headaches everyday for the last week as well as being generally irritable as well. 😒

It feels like my period just needs to come already but it doesn't seem to be!

I'm not overly worried about being pregnant but just in case how long does it take for symptoms to start? And what symptoms might they be?

Or does anyone know a way I can bring on this period? 🤷‍♀️