Could I be pregnant?

So I got a what I thought to be a positive pregnancy test two weeks ago, but after this experienced what I thought was my period. It was red, thin and watery with no clots and lasted about 5 days but quite light. I've been noticing some strange symptoms, I got nose bleeds with my last pregnancy and had a light one recently, then noticed when I'm supposed to be ovulating now that I'm having hot flushes, lotion CM and felt quite dizzy/sick yesterday and really hungry today, I've only just thought of the possibility that I might be pregnant now as my boss suggested it. I'm at work until tomorrow morning and desperate to find out what's going on, has anyone else experienced this?