False positive first response.

Hi there. Bit of a back story. Hubby and I have been ttc baby number 2 for 5 years I have pcos and he's fine. anyway day before yesterday I got my first faint positive first response pregnancy test then yesterday I did another and it was a stronger line I was so excited but it all came crashing down when I started to bleed. I went in for bloods same day as my positive test and got those results back today. The confusing part is. My blood hcg was below 1 but FRER was positive. I've since done another test and it's lighter. I'm so confused. Can anyone of you ladies confirm you've had a false positive or was my test, well 3 if them from two different packs just duds.