Faint Positives/Dr. Urine Test Negative Today

Ashley
Saturday morning I discovered I was pregnant when I took a First Response Early Result test and it had a faint line. 
This was a complete shock to my husband and me, since we have a 7 year old boy and an almost 9 year old girl. However, we quickly came to realize this was God's plan and we became quite giddy after I took another test with a faint positive. 
In the meantime I have taken five other tests at home. All of them were faint positives EXCEPT for two digital tests that said negative. My husband saw the lines on the tests as well, so I know it is not just my two eyes, but why would the digital ones say negative? This completely freaked me out, because I do not want to lose a baby, as I already lost one at 16 weeks in between my two children. 
Today got worse. I woke up with what seemed like a morning sickness, but it could be the virus that is circulating my community, so I stayed home from work. I went to my General Practicioner today and they did a urine test and it came back negative. They ran a blood test and I will find out results tomorrow. 
Am I in the early stages of a miscarriage? Is this a chemical pregnancy? I would appreciate any truthful answers. I really don't want to get my hopes up more than they already are.