That pregnancy causes flatulence. Because I just let one out at the post office that you would not believe. Long and quite loud. Thankfully there were very few people there and I was using the machine in the lobby, away from most of the patrons. It happened so suddenly that I didn't even really believe that I did it. I ignored it at first and then looked around to see if anyone was staring at me in disbelief or if there was someone standing behind me that I hadn't noticed. Luckily neither of those things were happening.
Now that the carpet is cleaned, I might be feeling ready to get this sucker out of me.