Well that's just embarrasing...

On Saturday after work, I went to the mall to shop for cute clothes. Trip was a huge success, I'm super excited about the clothes I picked! However, while I was at the store, I walked into the dressing room and noticed a wet stain in a circle centered around the nipple on my breast. I figured I'd leaned against something wet (even though it was dry outside- not a cloud in sight!) but then when I took my shirt off, the stain was larger on my bra... so I'm guessing that my nipple leaked and the moisture soaked through? But why on earth is my nipple leaking? If I am pregnant, it's by less than a week... I doubt I've even implanted yet. Any ideas?