anyone with PCOS had a false negative?

Georgia • 21 years old. Alison 17/01/16💖 Diesel🐶💙 16/06/17👼🏻💜 26/10/17👼🏻💜 30/01/18👼🏻💜 Henry 16/11/18💙 15/11/20 👼🏻👼🏻💜
Anyone had a false negative? I've seen lots of women online who have had false negatives and didn't get a BFP until around 20 weeks. 
I'm nearly 4 weeks late but bfn. I have lots of symptoms, this would be my second child so I know what are pregnancy symptoms not just AF and I'm usually regular (give or take a couple of days).
Has anyone on here with PCOS had a false negative? If so, when did you get a BFP or how did you find out/how far along were you? 
Thanks