So upset..

Ok so I got a positive pregnancy test on the 14th. Went to the clinic and got a negative one there. Took two more hpt both positive. Then on the 18th I started cramping and I know I had a miscarriage as I seen it when I went to the restroom. Also have had one once before so I know that's what happened. The only difference was I think I was farther along this time. How can their tests not be more sensitive. I'm just so upset. Have been ttc for almost 6 years, and when I finally am I lose it. Sorry just need to vent. Have tried talking to my husband but he does not understand pcos.