A week late, Neg home test - could I still be pregnant?

Hi - this is my first post, I'm hoping someone can help as I am feeling very confused.

My periods are like clockwork and I am now late by one week. About a week before my period was due I had some pink staining when I wipe, nothing like when I start my period and never enough to notice at any other time, this lasted around 2 days then went away.

From after this I started to develop nausea and sickness and a general feeling of being exhausted. My breasts got noticeably larger as well as swollen and sore. I put it down to a very bad period coming on and got on with it. Other symptoms included heartburn (which I never get), some tummy pain and I have been quiet emotional. 

When I missed my period I did test with a home test which came out negative, so I thought maybe I needed a little longer for my hormone levels to rise and left it a week, but still negative today. 

I booked a doctors appointment and they did a urine test whilst I was there and he said negative and not to worry about it, go home, get on with it and if I still feel this way in fortnight test again. I asked if they would blood test if I did still feel like this in 2 weeks and it was still negative and he said no as blood tests are no more accurate than urine tests, I always thought that blood tests were more accurate?

Lastly I just have this overwhelming feeling that something is different, I can't describe it as it is such an odd feeling, but when I said this the doctor looked at me as if I had gone mad!

I have heard of women not ever showing as positive on home pregnancy tests, and even worse that ectopic pregnancy does not always test as positive. 

Just as an aside I am not stressed or worried about anything in my life (or wasn't till today) I am healthy, not over or under weight. 

The doctor just didn't seem to be interested in helping and I would really appreciate some advice.

Many thanks in advance.

Becca