So on June 27th I received a faint line on my pregnancy test at home. One week ago I tested again, it was much darker. I went to the doc to do blood work and urine sample this past Monday (wasn't my first urine) their urine test came back negative but my HCG level for blood was 968 which is accurate for 4-5 weeks pregnant. I freak out and go to Walmart and get a urine test and it shows positive again. And now the first line is darker than the 2nd line. (Picture below).

Should I be concerned that I might be having a chemical or fake pregnancy?? My husband and I have been trying for 2 years after having our first.