Hello, I took a first response pregnancy test on the 17th and I got a very faint 2nd line the next day (18th) I took a clear blue digital test and got not pregnant. I also had some spotting yesterday (18th) and today but it has gotten heavy like a period. (Thought at 1st maybe it was inflation bleeding but since it has gotten sorta heavy I'm not sure )Could I be pregnant or could I have gotten a false positive on the 1st test or maybe misread it?