Hi I'm Experiencing A Lot Of Early Pregnany Symptoms, Nausa

Hi I'm experiencing a lot of early pregnany symptoms, nausa coming and going threw out the day, all I want to do is sleep I have no energy at all, I keep waking up to go toilet then struggle to get back to sleep and I'm urenating a lot more during the day, I'm getting cravings for food then feeling really nauseous from the smell of it but I have to eat it, I've got lower back ache, slight pulling pains in my lower abdomon with a rich white milky discharge with no odour, I feel like my bellys tight and I'm bloated. I calculate my cycle and it's a regular 27 day cycle my last period was 3/10/16 meaning I'm due on next the 30/10/16, with keeping my dates I worked out I ovulated on the 15/10/16. I had unprotected sex with my partner on the 14/10/16 and 15/10/16. I'm 23 and had two pregnancies to term and suffered from a miscarriage 18 months ago. I've done a home pregnancy test and it's come up negative. From the symptoms I'm experiencing is it too soon to get a positive test? And why am I suffering these symptoms for ?