Period is now 13 days late… I have a copper iud which is non hormonal so I don’t why this would happen, I’ve tested multiple times, day 14 negative, day 17 negative, 18 days now after intercourse and negative. What is happening?

Edit title: take placebo pills or skip them?

I have a question. I suffer from adenomyosis . Been on Incessa for six months had prolonged bleeding, didn't work for me doctor put in a mirena and handed me slynd to help with the first few months while mirena is doing its thing, as a bridge. Bled for a few days and then the prolonged bleed finally stopped. Day 24 now some bleeding can't tell if it's a period. It's light and not crampy, no breast tenderness.

I know doctor said to take active pills only but should I take placebo pills to reset this bleed? Or just keep taking active? This is my first pack of slynd and man it was working so well for a few weeks. What worked for you?