11dpo - bfn

So im 11dpo and took a pregnancy test this morning. Had all the same symptoms that I did a few years ago when I miscarried so I was absolutely convinced I was pregnant and now I'm devastated that it was a bfn :( it's my first month on Letrozole to try and shorten my cycles to 28 days rather than 36 and my gynp said I'd be pregnant within 3 months and I just really got my hopes up. AF isn't actually due for another 3 days - could it be that I just tested too early?? I'm 24 and have been trying for 2 years and I just feel like giving up :(