Need a buddy 😞😥

Early this year in January I found out I have PCOS been TTC since March 2014 and no luck AF was due on 20th November I am three days late I took a pregnancy test this morning with the first urine of the day but I got a BFN need advice on why I haven't been able to get pregnant or why AF hasn't turned up yet it's making me depressed knowing I can't have children as easy as other woman. It's really hard because my friends all have children now and have a family and that's all I want