Feeling hot, sick and dizzy. 5/6days late bfn

Kat

Feeling weird today I keep thinking my period is coming but it doesn't. I had a strange hot sick feeling earlier at the hairdressers.

Yesterday I took a test and was sure I saw a faint line but then after 10mins or so it dissapered. I'm confused.

Took a clear blue this morn and it's a definite bfn.

This is the photo of what to me looks like the fain line before it dissapered.

Any thoughts??