Missed period

Hi everyone,

Never posted on here before so here it goes.

I currently have missed by period by 5 days. This for me is unusual. I have had period pains over the first 3-4 of the 5 days and sore breasts throughout. On the 3rd day I had seriously bad cramps for around 45mins.

Now currently on the 5th day all period like symptoms seem to have disappeared. This morning I did a pregnancy test which came back negative so I’m now sat here wondering what on Earth it could be.

Keep wondering if it is down to stress however I don’t feel as though I’ve been stressed. Just slightly worried due to the negative test and no appearance of Aunt Flo.

Any ideas?