I know no one here is a doctor and can tell me what's going on, but I'm just looking similar experiences.
I've been on cerazette for just over two months. At first I had constant spotting and bleeding, a few weeks ago it stopped. I hoped I was a lucky one and not a constant "bleeder"
A few days ago I felt like I was having lots of similar pregnancy symptoms that I had with my first, so knowing the pill isn't 100% I ordered some tests. Yesterday I had very strong cramps and a bit of spotting. Today I woke up to my normal period. The tests came in the post and I decided to poas anyway.
It's come back with a very very faint line. It was dilute wee so I will hold and do another one. Maybe it's an evap.
If it was a chemical would the line have already gone by now?
It's extremely likey an evap but the uncertainty is rather unnerving.