Advise please

I'm certain I am pregnant for my second child  so many symptoms and just feel like I am I knew I was the day I conceived my daughter, this time I took a test yesterday and it came back negative but I don't believe it and still certain I am, 
My symptoms are 
Urging when brushing my teeth 
Can stand strong smells 
Indigestion 
Boobs are different and have leaked liquid 
Really tired more then usual 
Tummy feels harder 
Sex felt completely different to normal 
What's people's views please??