Help!!

I am so confused I have no idea what is going on with my body. I have taken a couple first response pregnancy tests at home and the have came out positive. I went to the doctor to have a test done and it said negative. They told me to come back in a week and test again so I did again it was negative. I have every symptom possible I do have two kids already so I do have an idea of what to expect. I feel like I am very much pregnant. I go into the doctor on Friday for blood work. Please pray for me. I wish I knew what was going on with my body. :(