Spotting 2 weeks after a period.

Jasmin

So I had a full period 3-10th Jan and then I spotted for 3 days on 23-26th Jan. This hasn't happened before, I have had the coil for 4 years or so. I have had a few things that have worried me, I also had headaches, cramps, boobs have changed slightly and I'm due on but haven't come on yet (I can't remember what my cycles are like thou) and felt slightly sick which isn't normal for me. I took a test which was negative but I'm still really worried.

Can anyone help/relate please?!

Thanks x