[Ennui.]

You're right that everyone is different, and sometimes it even depends on the pill. I've been on three different pills now and I can't say that my pill has made me worryingly heavy. For me personally, it's heavier for a few days then it gets lighter again. But, it's nowhere near as bad as it used to be (i.e. when I wake up in the morning and get up I don't gush anymore). Basically when you start birth control carry a pad/tampon with you just in case (and also for sanitary reasons) and everything will even out. If you have concerns about the pill you're on after a few months of letting it work you can always try another.