Probably not my month again, broken hearted?

Well, I got my hopes up again this month and I'm so disappointed. For the first time in years I'm 2 days late, and I was soooo happy because I'm never late, I'm always on a 28 day cycle. My last mc was 1/15 and I was due on 2/12 for af, but she didn't show up. So, I got my hopes up... I've been experiencing some mild cramping and sore nipps, but that's about it. Well, today a few hours ago (tmi) I wiped and saw very very light brownish discharge.. It wasn't alot, it was just a slight tint in my cm.... Because I saw this a few hours ago I am so disappointed because I am so sure that my af is coming anytime now. I'm heartbroken, but I"m not giving up. I have been trying to conceive my first with my hubby for a long time already and I'm so tired of being disappointed. To those of you who have gotten your bfp's congratulations! I guess the question is, is it possible to experience implantation this late?? I ovulated on 1/29 according to my itouch app. Or do I have to face reality and accept that this is af coming though???