I am not petite by any means (I'm 5'9, so actually quite tall), but I don't think being bigger or smaller makes any difference at all in how quickly you bounce back. I would say plan to be pretty much taking it easy for about a month, not so much because of discomfort, but giving birth and mothering a new baby is exhausting and hard work on your body, no matter its size. The best thing you can do now is just to make sure you're healthy, eating well, staying active assuming there's no reason you shouldn't be (like you're on bed rest) because that will help tremendously. You may also consider having a stash of iron tablets already in case you need them. I think something like 40% of new mums become anaemic after birth and I did and it was really rough. I was exhausted and dizzy and could barely stand up for the first few days. Taking the iron made a huge difference and I started to feel better quickly. It's not pleasant on your gut, but it's better than passing out! You may not need it, but if you do, it's cheap and at least you have it without needing to send someone out to the store.
Generally, our bodies don't make babies we can't birth naturally, sizewise. So you should be no more likely to tear or have an pelvic issues just because you're smaller. But it's always good to prepare beforehand. I got a nice soothing after birth spray for 'down there' made with natural ingredients, which helped (from Earth Mama Angel Baby). Lots of ladies also make pads with aloe and witch hazel and freeze them, which I haven't tried, but sounds nice. I also took lots of soothing soaking baths with lavender oil for the first week or two, probably twice a day, which my midwives recommended. I seriously don't like baths and could not at first even imagine getting in and out of a bath (had a small 2nd degree tear, which wasn't really a big deal, but it was pretty sore to start). But actually the baths were amazing and they really helped with healing but also just gave me a 20 minute break alone (and when you have a new baby, a 20 minute break is such a luxury!).
As for pads, you will honestly not care. It's gross and it's a lot of blood at first. I found it was pretty heavy for about the first week and then tapered off after that to a lighter flow and then went away altogether after a month. That sounds like a long time, but honestly, you just get on with it. I never, ever used pads before either, but they were great then. You will not want to even think about sticking a tampon up there, so you'll love the pads. I actually find now I even prefer pads. I'm 3+ years pp now and I only use a moon cup for my 2 heavy period days and use cloth pads the rest because I love them so much more. You'll be fine. If you have to lock yourself inside for a month though, then great. You should be resting and taking it easy and getting some sleep when you can, so that isn't a bad thing. You'll get back to normal life when you're feeling up to it, so there's no rush.