Jade - not that I want to get your hopes up but I had brown spotting (and slight red too) and cramping and - from about day 10 with 6 day transfer...I got BFP on day 14.(Didn't test before this because I sure it would be BFN due to spotting and cramping and didn't want to disappointment myself) I still had spotting on/off.

I then had beta to confirm BFP, and from 5wks5days to almost 13weeks I had brown spotting, sometimes thick dark brown sludge (Sorry TMI) and even some red spotting.I ended up having a few extra scans in first trimester because of it.They couldn't tell where bleeding was from and I didn't dtd once after transfer because I was so scared of bleeding and m/c.

I was pg with twins - who are now 3 wks old (though born 4.5 wks early on 1st July)

Don't give up - it could be implantation bleeding.
with hope
Trish