AAAhhhhh! Congrations!! That is a BFP hunny! I have heard a lot of women getting brown blood at start of pregnancy- like ur body is fluching out the 'old' blood, im not 100% sure but it all sounds normal to me and u are up the duff my love!!! That's sooo exciting and i am so happy for u. I'm almost certain u would not still be getting a positive because of ur bubs 15 weeks ago coz u have been getting BFN's til now. I would go to the Dr and get a blood test done so u know for sure. Let me know how u get on throughout the day xoxo