So confused.. pregnant or not

ttc for rainbow baby • My husband and I have been together 7 years. Married since Aug 2014. We started ttc in July 15 and got pregnant first month and it ended in an ectopic. We are now waiting for our rainbow baby .
On Sunday last week I got what I thought was implantation cramps that lasted almost 3 days. I took a test really early I know wednesday night. I got a really faint line. I was having bad shoulder pain and right side pain on wednesday and was given an ultrasound due to having ectopic 2 months ago with emergancy surgery and removal of left tube. My blood work was less than 2 and now I am not even getting slight lines. My period is supposed tube start Tuesday and I have every symptom i can imagine . Why aren't ny lines getting darker? I am so cinfused.