29-5-2009 - Pregnant, or what??

My mood while writing this blog: Ok

I'm new to this site, so I'm not entirely sure how it works, but I have some questions, so here goes. :) My husband and I are trying for another baby, and this past month was very odd.

I am on a regular 28 day cycle and my last AF began on May 8th.
According to ovulation calculator on WebMD.com I should've ovulated around the 22nd.
Did BD on 19th, 21st, 22nd.
Beginning on the 24th, I had very light occasional cramping (like what I'd get the day before AF), and some very scant pink & brown spotting. Spotting changed to just brown and continued off and on for two more days (no more pink and no red spotting at all).
Starting on the 26th, besides the spotting I've had virtually no CM, which has stayed the same up until now (the 29th).

How possible is it that I could've ovulated early? Could I be pregnant? I haven't had any problems with BBs or nausea or anything. Just a little more sleepy...and very irritable!

I had implantation bleeding with both of my other children but never brown spotting for several days--I've been worried, but have read that no two pregnancies are alike. Any comments? Suggestions? THANKS!! :)