Questions for my pregnancy testers!

Natasha
Hi girls,
​I was just wondering if anyone has experienced this. Any insight would be so appreciated!
​I figured we missed this month because last week I went to the doctors and got a negative blood test. Then yesterday (day before AF is due) I tested and got a very faint line on my first response test. So many emotions so I tested again this morning using the clearblue test (plus and minus) and it looked like a BFN tested the FR again as well and the line was even lighter than last night. :(
​Not sure what to think of that. AF is due today and just need to know of this has happened to anyone. I had a chemical a few months back. Hoping this isn't a repeat. 
​Thanks girls! Love having this TTC community! Xx!