Any experience with faint lines?

Hey ladies I have pcos, I have had two life saving operations in the past because I have had two ruptured cysts on my ovaries 😩 anyways when I was pregnant with my son I got a big thick positive line (although I didn’t test till I was about 7/8 weeks) and when pregnant with my angel baby again a strong positive but was about 8 weeks.... two months ago I had a chemical (I had a faint positive followed by bleeding two days later) anyways my question is... this month since about 9 dpo (16th may) I have been having very faint lines on tests, and a couple of negatives but mostly faint lines.... I am now 8 days late and STILL getting a very faint line... I heard somewhere that having pcos can cause false negatives or faint lines? So I’m just wondering if any of you lovely ladies have had faint lines even after missed period and gone on to finally get a strong bfp? Xx