Whats going on! Pregnant?

[confusedoverhere]

Not sure if this is the wrong place to post.
Im 4 days late now. Usually have a 27 day cycle. It usually starts 2 days before the one did the month before. Although I have had a couple of 43 day cycles in the last year.
I have had the copper coil for 2 and a half years now. And me and dh have only dtd twice since last AF
Havn't poas yet. Don't want to waste money buying one when it's probably nothing. It is nothing right?

Well, any method can fail.

Any signs that it could have become dislodged? Strings?

I've never been able to feel the strings, they cut them extremely short. Even the nurse at my check up said she had never seen such short strings. Havn't felt anything move or come out or anything. Ive read that irs more likely to move in the first year.