Pregnant/Bleeding with PCOS?🙄

Hi,

I’m 20 years old and we’ve been ttc since March. For the past couple months AF has lasted unusually long at an average of 3 weeks. Now a week after (6/14) I went to the bathroom and sure enough, there was moderate bleeding. Not sure if it’s AF since I’ve been extremely tired, nauseas and has headaches. Today I’ve been having odd cravings such as ranch and chips or ranch and pizza which I never eat. Can PCOS cause bleeding during pregnancy or false negatives? Haven’t tested since may 6th. Any help or just similar stories would be super helpful!