Home pregnancy test - neg

Hey!
I have PCOS (polycystic ovary syndrome) - I was diagnosed at the start of this year - but, I'm now experiencing pregnancy symptoms. I just had a 5 'period' which weren't a period.. It was just brown discharge for the whole 5 days, had no cramps, just a little pressure on my right side. Buuuuuut, I've done like 5 hpt and all negative?! Not sure if it's my pcos flaring but it's really getting a bit confusing! Any help?? :( please